172131191808 has 176 divisors, whose sum is σ = 494953791840. Its totient is φ = 52982185984.

The previous prime is 172131191783. The next prime is 172131191819. The reversal of 172131191808 is 808191131271.

It is a self number, because there is not a number n which added to its sum of digits gives 172131191808.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2736778 + ... + 2798966.

Almost surely, 2^172131191808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172131191808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247476895920).

172131191808 is an abundant number, since it is smaller than the sum of its proper divisors (322822600032).

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

172131191808 is a wasteful number, since it uses less digits than its factorization.

172131191808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62282 (or 62264 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 42.

It can be divided in two parts, 17213 and 1191808, that added together give a palindrome (1209021).

The spelling of 172131191808 in words is "one hundred seventy-two billion, one hundred thirty-one million, one hundred ninety-one thousand, eight hundred eight".