520172966068821 has 48 divisors (see below), whose sum is σ = 832118247979200. Its totient is φ = 311145166861056.

The previous prime is 520172966068817. The next prime is 520172966068837. The reversal of 520172966068821 is 128860669271025.

520172966068821 is a `hidden beast` number, since 5 + 2 + 0 + 17 + 2 + 9 + 6 + 606 + 8 + 8 + 2 + 1 = 666.

It is not a de Polignac number, because 520172966068821 - 2² = 520172966068817 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520172966068891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 422726215 + ... + 423954948.

It is an arithmetic number, because the mean of its divisors is an integer number (17335796832900).

Almost surely, 2^{520172966068821} is an apocalyptic number.

It is an amenable number.

520172966068821 is a deficient number, since it is larger than the sum of its proper divisors (311945281910379).

520172966068821 is a wasteful number, since it uses less digits than its factorization.

520172966068821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846681330 (or 846681327 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 63.

The spelling of 520172966068821 in words is "five hundred twenty trillion, one hundred seventy-two billion, nine hundred sixty-six million, sixty-eight thousand, eight hundred twenty-one".