78215736101625 has 40 divisors (see below), whose sum is σ = 145817307145224. Its totient is φ = 41715059248800.

The previous prime is 78215736101603. The next prime is 78215736101681. The reversal of 78215736101625 is 52610163751287.

78215736101625 is a `hidden beast` number, since 7 + 8 + 2 + 1 + 5 + 7 + 3 + 6 + 1 + 0 + 1 + 625 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 237317071104 + 77978419030521 = 487152^2 + 8830539^2 .

It is not a de Polignac number, because 78215736101625 - 2¹⁷ = 78215735970553 is a prime.

It is a super-2 number, since 2×78215736101625² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3862495362 + ... + 3862515611.

Almost surely, 2^{78215736101625} is an apocalyptic number.

78215736101625 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78215736101625 is a deficient number, since it is larger than the sum of its proper divisors (67601571043599).

78215736101625 is an equidigital number, since it uses as much as digits as its factorization.

78215736101625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7725011000 (or 7725010981 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 78215736101625 in words is "seventy-eight trillion, two hundred fifteen billion, seven hundred thirty-six million, one hundred one thousand, six hundred twenty-five".