52664406021 has 12 divisors (see below), whose sum is σ = 76251504940. Its totient is φ = 35026205760.

The previous prime is 52664406013. The next prime is 52664406031. The reversal of 52664406021 is 12060446625.

52664406021 is a `hidden beast` number, since 5 + 2 + 6 + 6 + 4 + 40 + 602 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2483925921 + 50180480100 = 49839^2 + 224010^2 .

It is not a de Polignac number, because 52664406021 - 2³ = 52664406013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52664406031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6945856 + ... + 6953433.

Almost surely, 2^52664406021 is an apocalyptic number.

It is an amenable number.

52664406021 is a deficient number, since it is larger than the sum of its proper divisors (23587098919).

52664406021 is a wasteful number, since it uses less digits than its factorization.

52664406021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13899716 (or 13899713 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 52664406021 in words is "fifty-two billion, six hundred sixty-four million, four hundred six thousand, twenty-one".