52631868721 has 4 divisors (see below), whose sum is σ = 53855865712. Its totient is φ = 51407871732.

The previous prime is 52631868713. The next prime is 52631868733. The reversal of 52631868721 is 12786813625.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 52631868721 - 2³ = 52631868713 is a prime.

It is a super-2 number, since 2×52631868721² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52631863721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611998431 + ... + 611998516.

It is an arithmetic number, because the mean of its divisors is an integer number (13463966428).

Almost surely, 2^52631868721 is an apocalyptic number.

It is an amenable number.

52631868721 is a deficient number, since it is larger than the sum of its proper divisors (1223996991).

52631868721 is a wasteful number, since it uses less digits than its factorization.

52631868721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223996990.

The product of its digits is 967680, while the sum is 49.

The spelling of 52631868721 in words is "fifty-two billion, six hundred thirty-one million, eight hundred sixty-eight thousand, seven hundred twenty-one".