81607677570 has 48 divisors (see below), whose sum is σ = 212243915520. Its totient is φ = 21755488032.

The previous prime is 81607677521. The next prime is 81607677587. The reversal of 81607677570 is 7577670618.

81607677570 is a `hidden beast` number, since 8 + 1 + 6 + 0 + 7 + 67 + 7 + 570 = 666.

It is a super-2 number, since 2×81607677570² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167337 + ... + 437283.

It is an arithmetic number, because the mean of its divisors is an integer number (4421748240).

Almost surely, 2^81607677570 is an apocalyptic number.

81607677570 is an abundant number, since it is smaller than the sum of its proper divisors (130636237950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81607677570 is a wasteful number, since it uses less digits than its factorization.

81607677570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273319 (or 273316 counting only the distinct ones).

The product of its (nonzero) digits is 3457440, while the sum is 54.

The spelling of 81607677570 in words is "eighty-one billion, six hundred seven million, six hundred seventy-seven thousand, five hundred seventy".