520641655 has 4 divisors (see below), whose sum is σ = 624769992. Its totient is φ = 416513320.

The previous prime is 520641637. The next prime is 520641659. The reversal of 520641655 is 556146025.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 520641655 - 2⁵ = 520641623 is a prime.

It is a super-2 number, since 2×520641655² = 542135465842278050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520641655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520641659) 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, 52064161 + ... + 52064170.

It is an arithmetic number, because the mean of its divisors is an integer number (156192498).

Almost surely, 2^520641655 is an apocalyptic number.

520641655 is a deficient number, since it is larger than the sum of its proper divisors (104128337).

520641655 is a wasteful number, since it uses less digits than its factorization.

520641655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104128336.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 520641655 is about 22817.5733810587. The cubic root of 520641655 is about 804.4757745830.

The spelling of 520641655 in words is "five hundred twenty million, six hundred forty-one thousand, six hundred fifty-five".