71520734056 has 8 divisors (see below), whose sum is σ = 134101376370. Its totient is φ = 35760367024.

The previous prime is 71520734041. The next prime is 71520734099. The reversal of 71520734056 is 65043702517.

It can be written as a sum of positive squares in only one way, i.e., 69889381956 + 1631352100 = 264366^2 + 40390^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×71520734056² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4470045871 + ... + 4470045886.

Almost surely, 2^71520734056 is an apocalyptic number.

It is an amenable number.

71520734056 is a deficient number, since it is larger than the sum of its proper divisors (62580642314).

71520734056 is a wasteful number, since it uses less digits than its factorization.

71520734056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8940091763 (or 8940091759 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 40.

The spelling of 71520734056 in words is "seventy-one billion, five hundred twenty million, seven hundred thirty-four thousand, fifty-six".