631979170145 has 4 divisors (see below), whose sum is σ = 758375004180. Its totient is φ = 505583336112.

The previous prime is 631979170139. The next prime is 631979170159. The reversal of 631979170145 is 541071979136.

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 316103697361 + 315875472784 = 562231^2 + 562028^2 .

It is a cyclic number.

It is not a de Polignac number, because 631979170145 - 2¹⁶ = 631979104609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63197917010 + ... + 63197917019.

It is an arithmetic number, because the mean of its divisors is an integer number (189593751045).

Almost surely, 2^631979170145 is an apocalyptic number.

It is an amenable number.

631979170145 is a deficient number, since it is larger than the sum of its proper divisors (126395834035).

631979170145 is a wasteful number, since it uses less digits than its factorization.

631979170145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126395834034.

The product of its (nonzero) digits is 1428840, while the sum is 53.

The spelling of 631979170145 in words is "six hundred thirty-one billion, nine hundred seventy-nine million, one hundred seventy thousand, one hundred forty-five".