520155655 has 4 divisors (see below), whose sum is σ = 624186792. Its totient is φ = 416124520.

The previous prime is 520155631. The next prime is 520155661. The reversal of 520155655 is 556551025.

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

It is a de Polignac number, because none of the positive numbers 2^k-520155655 is a prime.

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 520155655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52015561 + ... + 52015570.

It is an arithmetic number, because the mean of its divisors is an integer number (156046698).

Almost surely, 2^520155655 is an apocalyptic number.

520155655 is a deficient number, since it is larger than the sum of its proper divisors (104031137).

520155655 is a wasteful number, since it uses less digits than its factorization.

520155655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104031136.

The product of its (nonzero) digits is 37500, while the sum is 34.

The square root of 520155655 is about 22806.9212082648. The cubic root of 520155655 is about 804.2253803886.

The spelling of 520155655 in words is "five hundred twenty million, one hundred fifty-five thousand, six hundred fifty-five".