520644161601 has 12 divisors (see below), whose sum is σ = 796279306212. Its totient is φ = 326678689536.

The previous prime is 520644161593. The next prime is 520644161621. The reversal of 520644161601 is 106161446025.

520644161601 is a `hidden beast` number, since 5 + 2 + 0 + 6 + 4 + 41 + 6 + 1 + 601 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 242123043600 + 278521118001 = 492060^2 + 527751^2 .

It is not a de Polignac number, because 520644161601 - 2³ = 520644161593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (520644161621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1701451356 + ... + 1701451661.

It is an arithmetic number, because the mean of its divisors is an integer number (66356608851).

Almost surely, 2^520644161601 is an apocalyptic number.

520644161601 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

520644161601 is a deficient number, since it is larger than the sum of its proper divisors (275635144611).

520644161601 is a wasteful number, since it uses less digits than its factorization.

520644161601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402903040 (or 3402903037 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 520644161601 in words is "five hundred twenty billion, six hundred forty-four million, one hundred sixty-one thousand, six hundred one".