2172945856458 has 32 divisors (see below), whose sum is σ = 4691050060032. Its totient is φ = 667047441600.

The previous prime is 2172945856457. The next prime is 2172945856463. The reversal of 2172945856458 is 8546585492712.

It is a super-2 number, since 2×2172945856458² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2172945856457) 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, 32284573 + ... + 32351808.

It is an arithmetic number, because the mean of its divisors is an integer number (146595314376).

Almost surely, 2^{2172945856458} is an apocalyptic number.

2172945856458 is an abundant number, since it is smaller than the sum of its proper divisors (2518104203574).

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

2172945856458 is a wasteful number, since it uses less digits than its factorization.

2172945856458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64636830.

The product of its digits is 193536000, while the sum is 66.

The spelling of 2172945856458 in words is "two trillion, one hundred seventy-two billion, nine hundred forty-five million, eight hundred fifty-six thousand, four hundred fifty-eight".