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66561043 = 467142529
BaseRepresentation
bin1111110111101…
…0010000010011
311122020122120211
43331322100103
5114014423133
610334344551
71435521343
oct375722023
9148218524
1066561043
113463232a
121a35b157
1310a36443
148ba8d23
155c9bbcd
hex3f7a413

66561043 has 4 divisors (see below), whose sum is σ = 66704040. Its totient is φ = 66418048.

The previous prime is 66561041. The next prime is 66561059. The reversal of 66561043 is 34016566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66561043 - 21 = 66561041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66560996 and 66561014.

It is not an unprimeable number, because it can be changed into a prime (66561041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70798 + ... + 71731.

It is an arithmetic number, because the mean of its divisors is an integer number (16676010).

Almost surely, 266561043 is an apocalyptic number.

66561043 is a deficient number, since it is larger than the sum of its proper divisors (142997).

66561043 is a wasteful number, since it uses less digits than its factorization.

66561043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142996.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 66561043 is about 8158.4951431008. The cubic root of 66561043 is about 405.2658783545.

The spelling of 66561043 in words is "sixty-six million, five hundred sixty-one thousand, forty-three".

Divisors: 1 467 142529 66561043