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681909070909186 = 2923247736929909
BaseRepresentation
bin1001101100001100010101001…
…1111100001100111100000010
310022102102212111121110122012001
42123003011103330030330002
51203334344234123043221
610414144411424054214
7263430206316362461
oct23303052374147402
93272385447418161
10681909070909186
1118830601621712a
126459266816436a
1323365998770353
14c05680a2449d8
1553c8046dd1391
hex26c3153f0cf02

681909070909186 has 8 divisors (see below), whose sum is σ = 1022863744850940. Its totient is φ = 340954489292208.

The previous prime is 681909070909181. The next prime is 681909070909207.

681909070909186 is nontrivially palindromic in base 10.

681909070909186 is a nontrivial binomial coefficient, being equal to C(36929909, 2).

It can be written as a sum of positive squares in 2 ways, for example, as 515650766123025 + 166258304786161 = 22707945^2 + 12894119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (681909070909181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 36929908.

Almost surely, 2681909070909186 is an apocalyptic number.

681909070909186 is the 36929908-th triangular number.

681909070909186 is the 12309970-th centered nonagonal number.

681909070909186 is a deficient number, since it is larger than the sum of its proper divisors (340954673941754).

681909070909186 is a wasteful number, since it uses less digits than its factorization.

681909070909186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46162388.

The product of its (nonzero) digits is 105815808, while the sum is 73.

The spelling of 681909070909186 in words is "six hundred eighty-one trillion, nine hundred nine billion, seventy million, nine hundred nine thousand, one hundred eighty-six".

Divisors: 1 2 9232477 18464954 36929909 73859818 340954535454593 681909070909186