78921170668 has 48 divisors (see below), whose sum is σ = 149412380544. Its totient is φ = 36333434880.

The previous prime is 78921170659. The next prime is 78921170677. The reversal of 78921170668 is 86607112987.

It is an interprime number because it is at equal distance from previous prime (78921170659) and next prime (78921170677).

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 in 15 ways as a sum of consecutive naturals, for example, 10776448 + ... + 10783768.

It is an arithmetic number, because the mean of its divisors is an integer number (3112757928).

Almost surely, 2^78921170668 is an apocalyptic number.

It is an amenable number.

78921170668 is a deficient number, since it is larger than the sum of its proper divisors (70491209876).

78921170668 is a wasteful number, since it uses less digits than its factorization.

78921170668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10762 (or 10760 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 78921170668 in words is "seventy-eight billion, nine hundred twenty-one million, one hundred seventy thousand, six hundred sixty-eight".