78172961275 has 12 divisors (see below), whose sum is σ = 96939864400. Its totient is φ = 62534890080.

The previous prime is 78172961263. The next prime is 78172961327. The reversal of 78172961275 is 57216927187.

It is not a de Polignac number, because 78172961275 - 2³⁵ = 43813222907 is a prime.

It is a super-2 number, since 2×78172961275² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 432181 + ... + 585769.

Almost surely, 2^78172961275 is an apocalyptic number.

78172961275 is a deficient number, since it is larger than the sum of its proper divisors (18766903125).

78172961275 is a wasteful number, since it uses less digits than its factorization.

78172961275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173958 (or 173953 counting only the distinct ones).

The product of its digits is 2963520, while the sum is 55.

The spelling of 78172961275 in words is "seventy-eight billion, one hundred seventy-two million, nine hundred sixty-one thousand, two hundred seventy-five".