78922033994 has 4 divisors (see below), whose sum is σ = 118383050994. Its totient is φ = 39461016996.

The previous prime is 78922033933. The next prime is 78922034033. The reversal of 78922033994 is 49933022987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49933022987 = 31 ⋅1610742677.

It can be written as a sum of positive squares in only one way, i.e., 61461847225 + 17460186769 = 247915^2 + 132137^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19730508497 + ... + 19730508500.

Almost surely, 2^78922033994 is an apocalyptic number.

78922033994 is a deficient number, since it is larger than the sum of its proper divisors (39461017000).

78922033994 is a wasteful number, since it uses less digits than its factorization.

78922033994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39461016999.

The product of its (nonzero) digits is 5878656, while the sum is 56.

The spelling of 78922033994 in words is "seventy-eight billion, nine hundred twenty-two million, thirty-three thousand, nine hundred ninety-four".