520165657 has 4 divisors (see below), whose sum is σ = 567453456. Its totient is φ = 472877860.

The previous prime is 520165637. The next prime is 520165669. The reversal of 520165657 is 756561025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520165657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520165637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23643883 + ... + 23643904.

It is an arithmetic number, because the mean of its divisors is an integer number (141863364).

Almost surely, 2^520165657 is an apocalyptic number.

It is an amenable number.

520165657 is a deficient number, since it is larger than the sum of its proper divisors (47287799).

520165657 is a wasteful number, since it uses less digits than its factorization.

520165657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47287798.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 520165657 is about 22807.1404827523. The cubic root of 520165657 is about 804.2305351345.

The spelling of 520165657 in words is "five hundred twenty million, one hundred sixty-five thousand, six hundred fifty-seven".