78656659046864 has 40 divisors (see below), whose sum is σ = 162901861238592. Its totient is φ = 36700880142080.

The previous prime is 78656659046857. The next prime is 78656659046869. The reversal of 78656659046864 is 46864095665687.

It is a super-2 number, since 2×78656659046864² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78656659046869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2606581514 + ... + 2606611689.

Almost surely, 2^{78656659046864} is an apocalyptic number.

It is an amenable number.

78656659046864 is an abundant number, since it is smaller than the sum of its proper divisors (84245202191728).

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

78656659046864 is a wasteful number, since it uses less digits than its factorization.

78656659046864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5213193275 (or 5213193269 counting only the distinct ones).

The product of its (nonzero) digits is 12541132800, while the sum is 80.

The spelling of 78656659046864 in words is "seventy-eight trillion, six hundred fifty-six billion, six hundred fifty-nine million, forty-six thousand, eight hundred sixty-four".