72665924696978 has 18 divisors (see below), whose sum is σ = 110513814804117. Its totient is φ = 35834816542320.

The previous prime is 72665924696929. The next prime is 72665924696983. The reversal of 72665924696978 is 87969642956627.

It can be written as a sum of positive squares in 2 ways, for example, as 72331844164969 + 334080532009 = 8504813^2 + 577997^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=6027683.

It is a super-2 number, since 2×72665924696978² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72665924696978.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 880000433 + ... + 880083003.

Almost surely, 2^{72665924696978} is an apocalyptic number.

72665924696978 is a deficient number, since it is larger than the sum of its proper divisors (37847890107139).

72665924696978 is an frugal number, since it uses more digits than its factorization.

72665924696978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165290 (or 82646 counting only the distinct ones).

The product of its digits is 29628426240, while the sum is 86.

The spelling of 72665924696978 in words is "seventy-two trillion, six hundred sixty-five billion, nine hundred twenty-four million, six hundred ninety-six thousand, nine hundred seventy-eight".