172722621168 has 60 divisors (see below), whose sum is σ = 508824688840. Its totient is φ = 54543984768.

The previous prime is 172722621157. The next prime is 172722621217. The reversal of 172722621168 is 861126227271.

172722621168 is a `hidden beast` number, since 1 + 7 + 2 + 7 + 2 + 2 + 621 + 16 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31562071 + ... + 31567542.

Almost surely, 2^172722621168 is an apocalyptic number.

172722621168 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

172722621168 is an abundant number, since it is smaller than the sum of its proper divisors (336102067672).

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

172722621168 is a wasteful number, since it uses less digits than its factorization.

172722621168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63129646 (or 63129637 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The spelling of 172722621168 in words is "one hundred seventy-two billion, seven hundred twenty-two million, six hundred twenty-one thousand, one hundred sixty-eight".