123406643423536 has 40 divisors (see below), whose sum is σ = 260951121840528. Its totient is φ = 56069336832000.

The previous prime is 123406643423501. The next prime is 123406643423597. The reversal of 123406643423536 is 635324346604321.

It is a happy number.

It is a super-2 number, since 2×123406643423536² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153297385 + ... + 154100296.

Almost surely, 2^{123406643423536} is an apocalyptic number.

123406643423536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

123406643423536 is an abundant number, since it is smaller than the sum of its proper divisors (137544478416992).

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

123406643423536 is a wasteful number, since it uses less digits than its factorization.

123406643423536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307399981 (or 307399975 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 52.

The spelling of 123406643423536 in words is "one hundred twenty-three trillion, four hundred six billion, six hundred forty-three million, four hundred twenty-three thousand, five hundred thirty-six".