172205957189 has 16 divisors (see below), whose sum is σ = 210257088000. Its totient is φ = 137749298544.

The previous prime is 172205957089. The next prime is 172205957251. The reversal of 172205957189 is 981759502271.

It is a cyclic number.

It is not a de Polignac number, because 172205957189 - 2³² = 167910989893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172205957089) 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, 9653639 + ... + 9671460.

It is an arithmetic number, because the mean of its divisors is an integer number (13141068000).

Almost surely, 2^172205957189 is an apocalyptic number.

172205957189 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

172205957189 is a deficient number, since it is larger than the sum of its proper divisors (38051130811).

172205957189 is a wasteful number, since it uses less digits than its factorization.

172205957189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19325192.

The product of its (nonzero) digits is 3175200, while the sum is 56.

The spelling of 172205957189 in words is "one hundred seventy-two billion, two hundred five million, nine hundred fifty-seven thousand, one hundred eighty-nine".