7867866538656 has 72 divisors (see below), whose sum is σ = 22387668698304. Its totient is φ = 2621048760960.

The previous prime is 7867866538633. The next prime is 7867866538661. The reversal of 7867866538656 is 6568356687687.

7867866538656 is a `hidden beast` number, since 7 + 8 + 6 + 78 + 6 + 6 + 538 + 6 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7713960 + ... + 8674151.

It is an arithmetic number, because the mean of its divisors is an integer number (310939843032).

Almost surely, 2^{7867866538656} is an apocalyptic number.

It is an amenable number.

7867866538656 is an abundant number, since it is smaller than the sum of its proper divisors (14519802159648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7867866538656 is a wasteful number, since it uses less digits than its factorization.

7867866538656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16389794 (or 16389783 counting only the distinct ones).

The product of its digits is 14631321600, while the sum is 81.

The spelling of 7867866538656 in words is "seven trillion, eight hundred sixty-seven billion, eight hundred sixty-six million, five hundred thirty-eight thousand, six hundred fifty-six".