78612557525571 has 16 divisors (see below), whose sum is σ = 106435091395584. Its totient is φ = 51599990596704.

The previous prime is 78612557525549. The next prime is 78612557525587. The reversal of 78612557525571 is 17552575521687.

It is not a de Polignac number, because 78612557525571 - 2¹⁷ = 78612557394499 is a prime.

It is a super-2 number, since 2×78612557525571² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78612557525471) 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, 98718291 + ... + 99511436.

It is an arithmetic number, because the mean of its divisors is an integer number (6652193212224).

Almost surely, 2^{78612557525571} is an apocalyptic number.

78612557525571 is a deficient number, since it is larger than the sum of its proper divisors (27822533870013).

78612557525571 is a wasteful number, since it uses less digits than its factorization.

78612557525571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198231770.

The product of its digits is 205800000, while the sum is 66.

The spelling of 78612557525571 in words is "seventy-eight trillion, six hundred twelve billion, five hundred fifty-seven million, five hundred twenty-five thousand, five hundred seventy-one".