631772225365 has 4 divisors (see below), whose sum is σ = 758126670444. Its totient is φ = 505417780288.

The previous prime is 631772225363. The next prime is 631772225387. The reversal of 631772225365 is 563522277136.

631772225365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 498709965636 + 133062259729 = 706194^2 + 364777^2 .

It is a cyclic number.

It is not a de Polignac number, because 631772225365 - 2¹ = 631772225363 is a prime.

It is a super-2 number, since 2×631772225365² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631772225363) 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, 63177222532 + ... + 63177222541.

It is an arithmetic number, because the mean of its divisors is an integer number (189531667611).

Almost surely, 2^631772225365 is an apocalyptic number.

It is an amenable number.

631772225365 is a deficient number, since it is larger than the sum of its proper divisors (126354445079).

631772225365 is a wasteful number, since it uses less digits than its factorization.

631772225365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126354445078.

The product of its digits is 3175200, while the sum is 49.

The spelling of 631772225365 in words is "six hundred thirty-one billion, seven hundred seventy-two million, two hundred twenty-five thousand, three hundred sixty-five".