78102998668 has 12 divisors (see below), whose sum is σ = 137173680112. Its totient is φ = 38910518640.

The previous prime is 78102998591. The next prime is 78102998671. The reversal of 78102998668 is 86689920187.

It is a super-2 number, since 2×78102998668² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35243928 + ... + 35246143.

Almost surely, 2^78102998668 is an apocalyptic number.

It is an amenable number.

78102998668 is a deficient number, since it is larger than the sum of its proper divisors (59070681444).

78102998668 is a wasteful number, since it uses less digits than its factorization.

78102998668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70490352 (or 70490350 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 64.

The spelling of 78102998668 in words is "seventy-eight billion, one hundred two million, nine hundred ninety-eight thousand, six hundred sixty-eight".