78923026664 has 16 divisors (see below), whose sum is σ = 148301681220. Its totient is φ = 39375911680.

The previous prime is 78923026627. The next prime is 78923026669. The reversal of 78923026664 is 46662032987.

It can be written as a sum of positive squares in 2 ways, for example, as 75158222500 + 3764804164 = 274150^2 + 61358^2 .

It is not an unprimeable number, because it can be changed into a prime (78923026669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10696289 + ... + 10703664.

Almost surely, 2^78923026664 is an apocalyptic number.

It is an amenable number.

78923026664 is a deficient number, since it is larger than the sum of its proper divisors (69378654556).

78923026664 is a wasteful number, since it uses less digits than its factorization.

78923026664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21400420 (or 21400416 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 53.

The spelling of 78923026664 in words is "seventy-eight billion, nine hundred twenty-three million, twenty-six thousand, six hundred sixty-four".