87656521865072 has 20 divisors (see below), whose sum is σ = 173784150908280. Its totient is φ = 42808999050048.

The previous prime is 87656521864937. The next prime is 87656521865113. The reversal of 87656521865072 is 27056812565678.

It is a Smith number, since the sum of its digits (68) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 87656521864993 and 87656521865011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63703866947 + ... + 63703868322.

It is an arithmetic number, because the mean of its divisors is an integer number (8689207545414).

Almost surely, 2^{87656521865072} is an apocalyptic number.

It is an amenable number.

87656521865072 is a deficient number, since it is larger than the sum of its proper divisors (86127629043208).

87656521865072 is a wasteful number, since it uses less digits than its factorization.

87656521865072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127407735320 (or 127407735314 counting only the distinct ones).

The product of its (nonzero) digits is 338688000, while the sum is 68.

The spelling of 87656521865072 in words is "eighty-seven trillion, six hundred fifty-six billion, five hundred twenty-one million, eight hundred sixty-five thousand, seventy-two".