521570052081 has 48 divisors (see below), whose sum is σ = 825321777280. Its totient is φ = 315453346560.

The previous prime is 521570052077. The next prime is 521570052127. The reversal of 521570052081 is 180250075125.

521570052081 is a `hidden beast` number, since 5 + 2 + 1 + 57 + 0 + 0 + 520 + 81 = 666.

It is not a de Polignac number, because 521570052081 - 2² = 521570052077 is a prime.

It is a super-2 number, since 2×521570052081² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (521570052071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3365541 + ... + 3517101.

Almost surely, 2^521570052081 is an apocalyptic number.

It is an amenable number.

521570052081 is a deficient number, since it is larger than the sum of its proper divisors (303751725199).

521570052081 is a wasteful number, since it uses less digits than its factorization.

521570052081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152086 (or 152083 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 36.

The spelling of 521570052081 in words is "five hundred twenty-one billion, five hundred seventy million, fifty-two thousand, eighty-one".