78968928521 has 16 divisors (see below), whose sum is σ = 93227151360. Its totient is φ = 65458020240.

The previous prime is 78968928503. The next prime is 78968928527. The reversal of 78968928521 is 12582986987.

It is not a de Polignac number, because 78968928521 - 2⁶ = 78968928457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78968928527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182150 + ... + 437168.

It is an arithmetic number, because the mean of its divisors is an integer number (5826696960).

Almost surely, 2^78968928521 is an apocalyptic number.

It is an amenable number.

78968928521 is a deficient number, since it is larger than the sum of its proper divisors (14258222839).

78968928521 is a wasteful number, since it uses less digits than its factorization.

78968928521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256484.

The product of its digits is 34836480, while the sum is 65.

The spelling of 78968928521 in words is "seventy-eight billion, nine hundred sixty-eight million, nine hundred twenty-eight thousand, five hundred twenty-one".