80697653956521 has 48 divisors (see below), whose sum is σ = 133265226931200. Its totient is φ = 46095622911360.

The previous prime is 80697653956489. The next prime is 80697653956627. The reversal of 80697653956521 is 12565935679608.

80697653956521 is a `hidden beast` number, since 8 + 0 + 6 + 9 + 7 + 6 + 5 + 3 + 95 + 6 + 521 = 666.

It is not a de Polignac number, because 80697653956521 - 2⁵ = 80697653956489 is a prime.

It is a super-2 number, since 2×80697653956521² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 80697653956521.

It is not an unprimeable number, because it can be changed into a prime (80697653956921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2177409331 + ... + 2177446391.

It is an arithmetic number, because the mean of its divisors is an integer number (2776358894400).

Almost surely, 2^{80697653956521} is an apocalyptic number.

It is an amenable number.

80697653956521 is a deficient number, since it is larger than the sum of its proper divisors (52567572974679).

80697653956521 is a wasteful number, since it uses less digits than its factorization.

80697653956521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49126 (or 49123 counting only the distinct ones).

The product of its (nonzero) digits is 734832000, while the sum is 72.

The spelling of 80697653956521 in words is "eighty trillion, six hundred ninety-seven billion, six hundred fifty-three million, nine hundred fifty-six thousand, five hundred twenty-one".