520157515661 has 8 divisors (see below), whose sum is σ = 604541423040. Its totient is φ = 438292531008.

The previous prime is 520157515637. The next prime is 520157515663. The reversal of 520157515661 is 166515751025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 520157515661 - 2²² = 520153321357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520157515663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629730236 + ... + 629731061.

It is an arithmetic number, because the mean of its divisors is an integer number (75567677880).

Almost surely, 2^520157515661 is an apocalyptic number.

It is an amenable number.

520157515661 is a deficient number, since it is larger than the sum of its proper divisors (84383907379).

520157515661 is a wasteful number, since it uses less digits than its factorization.

520157515661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259461363.

The product of its (nonzero) digits is 315000, while the sum is 44.

The spelling of 520157515661 in words is "five hundred twenty billion, one hundred fifty-seven million, five hundred fifteen thousand, six hundred sixty-one".