78715715157 has 12 divisors (see below), whose sum is σ = 116773463820. Its totient is φ = 51058842048.

The previous prime is 78715715153. The next prime is 78715715159. The reversal of 78715715157 is 75151751787.

It is a happy number.

78715715157 is a `hidden beast` number, since 7 + 8 + 71 + 57 + 1 + 515 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 75584305476 + 3131409681 = 274926^2 + 55959^2 .

It is not a de Polignac number, because 78715715157 - 2² = 78715715153 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78715715153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118191432 + ... + 118192097.

It is an arithmetic number, because the mean of its divisors is an integer number (9731121985).

Almost surely, 2^78715715157 is an apocalyptic number.

It is an amenable number.

78715715157 is a deficient number, since it is larger than the sum of its proper divisors (38057748663).

78715715157 is a wasteful number, since it uses less digits than its factorization.

78715715157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236383572 (or 236383569 counting only the distinct ones).

The product of its digits is 2401000, while the sum is 54.

The spelling of 78715715157 in words is "seventy-eight billion, seven hundred fifteen million, seven hundred fifteen thousand, one hundred fifty-seven".