52538668621 has 4 divisors (see below), whose sum is σ = 52623821052. Its totient is φ = 52453516192.

The previous prime is 52538668619. The next prime is 52538668673. The reversal of 52538668621 is 12686683525.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 504496521 + 52034172100 = 22461^2 + 228110^2 .

It is a cyclic number.

It is not a de Polignac number, because 52538668621 - 2¹ = 52538668619 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 (52538668601) 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 3 ways as a sum of consecutive naturals, for example, 42575290 + ... + 42576523.

It is an arithmetic number, because the mean of its divisors is an integer number (13155955263).

Almost surely, 2^52538668621 is an apocalyptic number.

It is an amenable number.

52538668621 is a deficient number, since it is larger than the sum of its proper divisors (85152431).

52538668621 is an equidigital number, since it uses as much as digits as its factorization.

52538668621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85152430.

The product of its digits is 4147200, while the sum is 52.

The spelling of 52538668621 in words is "fifty-two billion, five hundred thirty-eight million, six hundred sixty-eight thousand, six hundred twenty-one".