520640731475 has 6 divisors (see below), whose sum is σ = 645594507060. Its totient is φ = 416512585160.

The previous prime is 520640731423. The next prime is 520640731549. The reversal of 520640731475 is 574137046025.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-520640731475 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10412814605 + ... + 10412814654.

It is an arithmetic number, because the mean of its divisors is an integer number (107599084510).

Almost surely, 2^520640731475 is an apocalyptic number.

520640731475 is a deficient number, since it is larger than the sum of its proper divisors (124953775585).

520640731475 is a wasteful number, since it uses less digits than its factorization.

520640731475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20825629269 (or 20825629264 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 44.

The spelling of 520640731475 in words is "five hundred twenty billion, six hundred forty million, seven hundred thirty-one thousand, four hundred seventy-five".