123991722420985 has 64 divisors (see below), whose sum is σ = 153479050560000. Its totient is φ = 96108030627840.

The previous prime is 123991722420919. The next prime is 123991722420991. The reversal of 123991722420985 is 589024227199321.

It is not a de Polignac number, because 123991722420985 - 2⁷ = 123991722420857 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23355002511 + ... + 23355007819.

It is an arithmetic number, because the mean of its divisors is an integer number (2398110165000).

Almost surely, 2^{123991722420985} is an apocalyptic number.

It is an amenable number.

123991722420985 is a deficient number, since it is larger than the sum of its proper divisors (29487328139015).

123991722420985 is a wasteful number, since it uses less digits than its factorization.

123991722420985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7106.

The product of its (nonzero) digits is 39191040, while the sum is 64.

The spelling of 123991722420985 in words is "one hundred twenty-three trillion, nine hundred ninety-one billion, seven hundred twenty-two million, four hundred twenty thousand, nine hundred eighty-five".