172131474736 has 80 divisors (see below), whose sum is σ = 367690501024. Its totient is φ = 77559939072.

The previous prime is 172131474721. The next prime is 172131474737. The reversal of 172131474736 is 637474131271.

It is not an unprimeable number, because it can be changed into a prime (172131474737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27159760 + ... + 27166096.

Almost surely, 2^172131474736 is an apocalyptic number.

172131474736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172131474736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183845250512).

172131474736 is an abundant number, since it is smaller than the sum of its proper divisors (195559026288).

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

172131474736 is a wasteful number, since it uses less digits than its factorization.

172131474736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9438 (or 9432 counting only the distinct ones).

The product of its digits is 592704, while the sum is 46.

The spelling of 172131474736 in words is "one hundred seventy-two billion, one hundred thirty-one million, four hundred seventy-four thousand, seven hundred thirty-six".