123255435210520 has 32 divisors (see below), whose sum is σ = 278110351717920. Its totient is φ = 49162507863040.

The previous prime is 123255435210511. The next prime is 123255435210527. The reversal of 123255435210520 is 25012534552321.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123255435210527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4364555116 + ... + 4364583355.

It is an arithmetic number, because the mean of its divisors is an integer number (8690948491185).

Almost surely, 2^{123255435210520} is an apocalyptic number.

123255435210520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123255435210520 is an abundant number, since it is smaller than the sum of its proper divisors (154854916507400).

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

123255435210520 is a wasteful number, since it uses less digits than its factorization.

123255435210520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8729138835 (or 8729138831 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 40.

Adding to 123255435210520 its reverse (25012534552321), we get a palindrome (148267969762841).

The spelling of 123255435210520 in words is "one hundred twenty-three trillion, two hundred fifty-five billion, four hundred thirty-five million, two hundred ten thousand, five hundred twenty".