78931966406 has 4 divisors (see below), whose sum is σ = 118397949612. Its totient is φ = 39465983202.

The previous prime is 78931966397. The next prime is 78931966441. The reversal of 78931966406 is 60466913987.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60466913987 = 863 ⋅70065949.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19732991600 + ... + 19732991603.

It is an arithmetic number, because the mean of its divisors is an integer number (29599487403).

Almost surely, 2^78931966406 is an apocalyptic number.

78931966406 is a deficient number, since it is larger than the sum of its proper divisors (39465983206).

78931966406 is a wasteful number, since it uses less digits than its factorization.

78931966406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39465983205.

The product of its (nonzero) digits is 11757312, while the sum is 59.

The spelling of 78931966406 in words is "seventy-eight billion, nine hundred thirty-one million, nine hundred sixty-six thousand, four hundred six".