78765618512 has 40 divisors (see below), whose sum is σ = 174482880000. Its totient is φ = 33742507392.

The previous prime is 78765618499. The next prime is 78765618551. The reversal of 78765618512 is 21581656787.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122114 + ... + 415262.

It is an arithmetic number, because the mean of its divisors is an integer number (4362072000).

Almost surely, 2^78765618512 is an apocalyptic number.

It is an amenable number.

78765618512 is an abundant number, since it is smaller than the sum of its proper divisors (95717261488).

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

78765618512 is a wasteful number, since it uses less digits than its factorization.

78765618512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295563 (or 295557 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 56.

The spelling of 78765618512 in words is "seventy-eight billion, seven hundred sixty-five million, six hundred eighteen thousand, five hundred twelve".