78673962521 has 16 divisors (see below), whose sum is σ = 98096842368. Its totient is φ = 61298246400.

The previous prime is 78673962503. The next prime is 78673962527. The reversal of 78673962521 is 12526937687.

It is a cyclic number.

It is not a de Polignac number, because 78673962521 - 2²⁶ = 78606853657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78673962527) 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, 817841 + ... + 908961.

It is an arithmetic number, because the mean of its divisors is an integer number (6131052648).

Almost surely, 2^78673962521 is an apocalyptic number.

It is an amenable number.

78673962521 is a deficient number, since it is larger than the sum of its proper divisors (19422879847).

78673962521 is a wasteful number, since it uses less digits than its factorization.

78673962521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102352.

The product of its digits is 7620480, while the sum is 56.

The spelling of 78673962521 in words is "seventy-eight billion, six hundred seventy-three million, nine hundred sixty-two thousand, five hundred twenty-one".