123255443351520 has 144 divisors (see below), whose sum is σ = 420716435931792. Its totient is φ = 32859738408960.

The previous prime is 123255443351479. The next prime is 123255443351617. The reversal of 123255443351520 is 25153344552321.

123255443351520 is a `hidden beast` number, since 1 + 2 + 3 + 2 + 5 + 5 + 44 + 33 + 51 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 5260141 + ... + 16558380.

It is an arithmetic number, because the mean of its divisors is an integer number (2921641916193).

Almost surely, 2^{123255443351520} is an apocalyptic number.

123255443351520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123255443351520 is an abundant number, since it is smaller than the sum of its proper divisors (297460992580272).

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

123255443351520 is a wasteful number, since it uses less digits than its factorization.

123255443351520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21822465 (or 21822454 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 45.

The spelling of 123255443351520 in words is "one hundred twenty-three trillion, two hundred fifty-five billion, four hundred forty-three million, three hundred fifty-one thousand, five hundred twenty".