71521570612 has 12 divisors (see below), whose sum is σ = 125201629476. Its totient is φ = 35749676480.

The previous prime is 71521570579. The next prime is 71521570669. The reversal of 71521570612 is 21607512517.

It can be written as a sum of positive squares in 2 ways, for example, as 31874389156 + 39647181456 = 178534^2 + 199116^2 .

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, 2762713 + ... + 2788480.

It is an arithmetic number, because the mean of its divisors is an integer number (10433469123).

Almost surely, 2^71521570612 is an apocalyptic number.

It is an amenable number.

71521570612 is a deficient number, since it is larger than the sum of its proper divisors (53680058864).

71521570612 is a wasteful number, since it uses less digits than its factorization.

71521570612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554418 (or 5554416 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 37.

The spelling of 71521570612 in words is "seventy-one billion, five hundred twenty-one million, five hundred seventy thousand, six hundred twelve".