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206989499521 = 7172959979571
BaseRepresentation
bin1100000011000110001…
…0010001110010000001
3201210021110021001100001
43000301202101302001
511342403302441041
6235031211200001
720645251500430
oct3006142216201
9653243231301
10206989499521
117a8691a3692
1234148446001
13166993b97cc
14a0384a7117
1555b6db7131
hex3031891c81

206989499521 has 16 divisors (see below), whose sum is σ = 259111751040. Its totient is φ = 161225084160.

The previous prime is 206989499491. The next prime is 206989499531. The reversal of 206989499521 is 125994989602.

It is not a de Polignac number, because 206989499521 - 213 = 206989491329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206989499531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29986335 + ... + 29993236.

It is an arithmetic number, because the mean of its divisors is an integer number (16194484440).

Almost surely, 2206989499521 is an apocalyptic number.

It is an amenable number.

206989499521 is a deficient number, since it is larger than the sum of its proper divisors (52122251519).

206989499521 is a wasteful number, since it uses less digits than its factorization.

206989499521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59979624.

The product of its (nonzero) digits is 25194240, while the sum is 64.

The spelling of 206989499521 in words is "two hundred six billion, nine hundred eighty-nine million, four hundred ninety-nine thousand, five hundred twenty-one".

Divisors: 1 7 17 29 119 203 493 3451 59979571 419856997 1019652707 1739407559 7137568949 12175852913 29569928503 206989499521