172113621550 has 48 divisors (see below), whose sum is σ = 344801212560. Its totient is φ = 63541463040.

The previous prime is 172113621499. The next prime is 172113621571. The reversal of 172113621550 is 55126311271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7768789 + ... + 7790911.

It is an arithmetic number, because the mean of its divisors is an integer number (7183358595).

Almost surely, 2^172113621550 is an apocalyptic number.

172113621550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172113621550 is an abundant number, since it is smaller than the sum of its proper divisors (172687591010).

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

172113621550 is a wasteful number, since it uses less digits than its factorization.

172113621550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34117 (or 34112 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 34.

The spelling of 172113621550 in words is "one hundred seventy-two billion, one hundred thirteen million, six hundred twenty-one thousand, five hundred fifty".