2172642954891 has 8 divisors (see below), whose sum is σ = 2901293504400. Its totient is φ = 1446210520992.

The previous prime is 2172642954871. The next prime is 2172642954893. The reversal of 2172642954891 is 1984592462712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2172642954891 - 2⁶ = 2172642954827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2172642954893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 554526616 + ... + 554530533.

It is an arithmetic number, because the mean of its divisors is an integer number (362661688050).

Almost surely, 2^{2172642954891} is an apocalyptic number.

2172642954891 is a deficient number, since it is larger than the sum of its proper divisors (728650549509).

2172642954891 is a wasteful number, since it uses less digits than its factorization.

2172642954891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109057805.

The product of its digits is 17418240, while the sum is 60.

The spelling of 2172642954891 in words is "two trillion, one hundred seventy-two billion, six hundred forty-two million, nine hundred fifty-four thousand, eight hundred ninety-one".