78700775121 has 16 divisors (see below), whose sum is σ = 122730254400. Its totient is φ = 49705752384.

The previous prime is 78700775107. The next prime is 78700775183. The reversal of 78700775121 is 12157700787.

It is a happy number.

It is not a de Polignac number, because 78700775121 - 2²² = 78696580817 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78700775191) 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, 76705896 + ... + 76706921.

It is an arithmetic number, because the mean of its divisors is an integer number (7670640900).

Almost surely, 2^78700775121 is an apocalyptic number.

It is an amenable number.

78700775121 is a deficient number, since it is larger than the sum of its proper divisors (44029479279).

78700775121 is a wasteful number, since it uses less digits than its factorization.

78700775121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153412845 (or 153412839 counting only the distinct ones).

The product of its (nonzero) digits is 192080, while the sum is 45.

The spelling of 78700775121 in words is "seventy-eight billion, seven hundred million, seven hundred seventy-five thousand, one hundred twenty-one".