71407581992 has 8 divisors (see below), whose sum is σ = 133889216250. Its totient is φ = 35703790992.

The previous prime is 71407581943. The next prime is 71407582007. The reversal of 71407581992 is 29918570417.

It can be written as a sum of positive squares in only one way, i.e., 38230416676 + 33177165316 = 195526^2 + 182146^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4462973867 + ... + 4462973882.

Almost surely, 2^71407581992 is an apocalyptic number.

It is an amenable number.

71407581992 is a deficient number, since it is larger than the sum of its proper divisors (62481634258).

71407581992 is a wasteful number, since it uses less digits than its factorization.

71407581992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8925947755 (or 8925947751 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 53.

The spelling of 71407581992 in words is "seventy-one billion, four hundred seven million, five hundred eighty-one thousand, nine hundred ninety-two".