632172901209 has 24 divisors (see below), whose sum is σ = 875789162976. Its totient is φ = 405377851200.

The previous prime is 632172901207. The next prime is 632172901237. The reversal of 632172901209 is 902109271236.

It is not a de Polignac number, because 632172901209 - 2¹ = 632172901207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (632172901207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110262 + ... + 1129824.

It is an arithmetic number, because the mean of its divisors is an integer number (36491215124).

Almost surely, 2^632172901209 is an apocalyptic number.

It is an amenable number.

632172901209 is a deficient number, since it is larger than the sum of its proper divisors (243616261767).

632172901209 is a wasteful number, since it uses less digits than its factorization.

632172901209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019749 (or 1019678 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 632172901209 in words is "six hundred thirty-two billion, one hundred seventy-two million, nine hundred one thousand, two hundred nine".