172061647722138 has 64 divisors (see below), whose sum is σ = 367405956403200. Its totient is φ = 53560467319680.

The previous prime is 172061647722127. The next prime is 172061647722221. The reversal of 172061647722138 is 831227746160271.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8761333 + ... + 20515463.

It is an arithmetic number, because the mean of its divisors is an integer number (5740718068800).

Almost surely, 2^{172061647722138} is an apocalyptic number.

172061647722138 is an abundant number, since it is smaller than the sum of its proper divisors (195344308681062).

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

172061647722138 is a wasteful number, since it uses less digits than its factorization.

172061647722138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11755987.

The product of its (nonzero) digits is 9483264, while the sum is 57.

The spelling of 172061647722138 in words is "one hundred seventy-two trillion, sixty-one billion, six hundred forty-seven million, seven hundred twenty-two thousand, one hundred thirty-eight".