71557677772 has 12 divisors (see below), whose sum is σ = 143115355600. Its totient is φ = 30667576176.

The previous prime is 71557677757. The next prime is 71557677781. The reversal of 71557677772 is 27777675517.

71557677772 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 71557677772.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277815647 + ... + 1277815702.

Almost surely, 2^71557677772 is an apocalyptic number.

It is an amenable number.

71557677772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

71557677772 is a wasteful number, since it uses less digits than its factorization.

71557677772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555631360 (or 2555631358 counting only the distinct ones).

The product of its digits is 35294700, while the sum is 61.

The spelling of 71557677772 in words is "seventy-one billion, five hundred fifty-seven million, six hundred seventy-seven thousand, seven hundred seventy-two".