71539811312 has 20 divisors (see below), whose sum is σ = 140880654936. Its totient is φ = 35183513280.

The previous prime is 71539811297. The next prime is 71539811323. The reversal of 71539811312 is 21311893517.

It is a super-2 number, since 2×71539811312² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71539811312.

It is a congruent number.

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, 36648518 + ... + 36650469.

Almost surely, 2^71539811312 is an apocalyptic number.

It is an amenable number.

71539811312 is a deficient number, since it is larger than the sum of its proper divisors (69340843624).

71539811312 is a wasteful number, since it uses less digits than its factorization.

71539811312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73299056 (or 73299050 counting only the distinct ones).

The product of its digits is 45360, while the sum is 41.

The spelling of 71539811312 in words is "seventy-one billion, five hundred thirty-nine million, eight hundred eleven thousand, three hundred twelve".