520165669 has 2 divisors, whose sum is σ = 520165670. Its totient is φ = 520165668.

The previous prime is 520165637. The next prime is 520165673. The reversal of 520165669 is 966561025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379743169 + 140422500 = 19487^2 + 11850^2 .

It is a cyclic number.

It is not a de Polignac number, because 520165669 - 2⁵ = 520165637 is a prime.

It is a super-2 number, since 2×520165669² = 541144646412435122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520165619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260082834 + 260082835.

It is an arithmetic number, because the mean of its divisors is an integer number (260082835).

Almost surely, 2^520165669 is an apocalyptic number.

It is an amenable number.

520165669 is a deficient number, since it is larger than the sum of its proper divisors (1).

520165669 is an equidigital number, since it uses as much as digits as its factorization.

520165669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 520165669 is about 22807.1407458278. The cubic root of 520165669 is about 804.2305413189.

The spelling of 520165669 in words is "five hundred twenty million, one hundred sixty-five thousand, six hundred sixty-nine".