71705513256 has 64 divisors (see below), whose sum is σ = 204409396800. Its totient is φ = 20765395968.

The previous prime is 71705513219. The next prime is 71705513267. The reversal of 71705513256 is 65231550717.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6754266 + ... + 6764873.

It is an arithmetic number, because the mean of its divisors is an integer number (3193896825).

Almost surely, 2^71705513256 is an apocalyptic number.

It is an amenable number.

71705513256 is an abundant number, since it is smaller than the sum of its proper divisors (132703883544).

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

71705513256 is a wasteful number, since it uses less digits than its factorization.

71705513256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13519178 (or 13519174 counting only the distinct ones).

The product of its (nonzero) digits is 220500, while the sum is 42.

The spelling of 71705513256 in words is "seventy-one billion, seven hundred five million, five hundred thirteen thousand, two hundred fifty-six".