172099921770 has 96 divisors (see below), whose sum is σ = 541463989248. Its totient is φ = 37023174144.

The previous prime is 172099921759. The next prime is 172099921771. The reversal of 172099921770 is 77129990271.

172099921770 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (172099921771) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8023834 + ... + 8045253.

It is an arithmetic number, because the mean of its divisors is an integer number (5640249888).

Almost surely, 2^172099921770 is an apocalyptic number.

172099921770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172099921770 is an abundant number, since it is smaller than the sum of its proper divisors (369364067478).

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

172099921770 is a wasteful number, since it uses less digits than its factorization.

172099921770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16069124 (or 16069121 counting only the distinct ones).

The product of its (nonzero) digits is 1000188, while the sum is 54.

The spelling of 172099921770 in words is "one hundred seventy-two billion, ninety-nine million, nine hundred twenty-one thousand, seven hundred seventy".