78749901512 has 16 divisors (see below), whose sum is σ = 150076657500. Its totient is φ = 38729459520.

The previous prime is 78749901511. The next prime is 78749901523. The reversal of 78749901512 is 21510994787.

It can be written as a sum of positive squares in 2 ways, for example, as 74980678276 + 3769223236 = 273826^2 + 61394^2 .

It is a super-2 number, since 2×78749901512² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78749901511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80685887 + ... + 80686862.

Almost surely, 2^78749901512 is an apocalyptic number.

It is an amenable number.

78749901512 is a deficient number, since it is larger than the sum of its proper divisors (71326755988).

78749901512 is a wasteful number, since it uses less digits than its factorization.

78749901512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161372816 (or 161372812 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 53.

The spelling of 78749901512 in words is "seventy-eight billion, seven hundred forty-nine million, nine hundred one thousand, five hundred twelve".