5256505721631 has 16 divisors (see below), whose sum is σ = 7027202239200. Its totient is φ = 3495074487168.

The previous prime is 5256505721629. The next prime is 5256505721639. The reversal of 5256505721631 is 1361275056525.

It is not a de Polignac number, because 5256505721631 - 2¹ = 5256505721629 is a prime.

It is a super-2 number, since 2×5256505721631² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5256505721639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16635445 + ... + 16948481.

It is an arithmetic number, because the mean of its divisors is an integer number (439200139950).

Almost surely, 2^{5256505721631} is an apocalyptic number.

5256505721631 is a deficient number, since it is larger than the sum of its proper divisors (1770696517569).

5256505721631 is a wasteful number, since it uses less digits than its factorization.

5256505721631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327818.

The product of its (nonzero) digits is 1890000, while the sum is 48.

The spelling of 5256505721631 in words is "five trillion, two hundred fifty-six billion, five hundred five million, seven hundred twenty-one thousand, six hundred thirty-one".