631645288722 has 90 divisors (see below), whose sum is σ = 1596981654567. Its totient is φ = 180422876088.

The previous prime is 631645288639. The next prime is 631645288727. The reversal of 631645288722 is 227882546136.

631645288722 is a `hidden beast` number, since 6 + 3 + 16 + 4 + 528 + 87 + 22 = 666.

It can be written as a sum of positive squares in only one way, i.e., 315822644361 + 315822644361 = 561981^2 + 561981^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=561981.

It is not an unprimeable number, because it can be changed into a prime (631645288727) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 165220503 + ... + 165224325.

Almost surely, 2^631645288722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631645288722

631645288722 is an abundant number, since it is smaller than the sum of its proper divisors (965336365845).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631645288722 is an frugal number, since it uses more digits than its factorization.

631645288722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7682 (or 3835 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The spelling of 631645288722 in words is "six hundred thirty-one billion, six hundred forty-five million, two hundred eighty-eight thousand, seven hundred twenty-two".