2172908681178 has 64 divisors (see below), whose sum is σ = 4560815960064. Its totient is φ = 688833288000.

The previous prime is 2172908681149. The next prime is 2172908681213. The reversal of 2172908681178 is 8711868092712.

It is a Curzon number.

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, 192100143 + ... + 192111453.

It is an arithmetic number, because the mean of its divisors is an integer number (71262749376).

Almost surely, 2^{2172908681178} is an apocalyptic number.

2172908681178 is an abundant number, since it is smaller than the sum of its proper divisors (2387907278886).

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

2172908681178 is a wasteful number, since it uses less digits than its factorization.

2172908681178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19211.

The product of its (nonzero) digits is 5419008, while the sum is 60.

The spelling of 2172908681178 in words is "two trillion, one hundred seventy-two billion, nine hundred eight million, six hundred eighty-one thousand, one hundred seventy-eight".