52521639557 has 2 divisors, whose sum is σ = 52521639558. Its totient is φ = 52521639556.

The previous prime is 52521639517. The next prime is 52521639629. The reversal of 52521639557 is 75593612525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44853309796 + 7668329761 = 211786^2 + 87569^2 .

It is a cyclic number.

It is not a de Polignac number, because 52521639557 - 2¹² = 52521635461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52521639517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26260819778 + 26260819779.

It is an arithmetic number, because the mean of its divisors is an integer number (26260819779).

Almost surely, 2^52521639557 is an apocalyptic number.

It is an amenable number.

52521639557 is a deficient number, since it is larger than the sum of its proper divisors (1).

52521639557 is an equidigital number, since it uses as much as digits as its factorization.

52521639557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2835000, while the sum is 50.

The spelling of 52521639557 in words is "fifty-two billion, five hundred twenty-one million, six hundred thirty-nine thousand, five hundred fifty-seven".