123615556020 has 144 divisors (see below), whose sum is σ = 423160657920. Its totient is φ = 28934035200.

The previous prime is 123615556007. The next prime is 123615556109. The reversal of 123615556020 is 20655516321.

123615556020 is a `hidden beast` number, since 1 + 2 + 36 + 15 + 5 + 5 + 602 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1018996 + ... + 1133835.

It is an arithmetic number, because the mean of its divisors is an integer number (2938615680).

Almost surely, 2^123615556020 is an apocalyptic number.

123615556020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123615556020 is an abundant number, since it is smaller than the sum of its proper divisors (299545101900).

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

123615556020 is a wasteful number, since it uses less digits than its factorization.

123615556020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152886 (or 2152881 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 123615556020 in words is "one hundred twenty-three billion, six hundred fifteen million, five hundred fifty-six thousand, twenty".