521657055 has 48 divisors (see below), whose sum is σ = 934895520. Its totient is φ = 268934400.

The previous prime is 521657039. The next prime is 521657069. The reversal of 521657055 is 550756125.

It is a happy number.

521657055 is a `hidden beast` number, since 521 + 65 + 70 + 5 + 5 = 666.

It is not a de Polignac number, because 521657055 - 2⁴ = 521657039 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 160345 + ... + 163565.

It is an arithmetic number, because the mean of its divisors is an integer number (19476990).

Almost surely, 2^521657055 is an apocalyptic number.

521657055 is a deficient number, since it is larger than the sum of its proper divisors (413238465).

521657055 is a wasteful number, since it uses less digits than its factorization.

521657055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3352 (or 3349 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 36.

The square root of 521657055 is about 22839.8129370623. The cubic root of 521657055 is about 804.9984208397.

The spelling of 521657055 in words is "five hundred twenty-one million, six hundred fifty-seven thousand, fifty-five".