123112442500 has 60 divisors (see below), whose sum is σ = 275788916172. Its totient is φ = 48043840000.

The previous prime is 123112442491. The next prime is 123112442501. The reversal of 123112442500 is 5244211321.

It can be written as a sum of positive squares in 10 ways, for example, as 93011580484 + 30100862016 = 304978^2 + 173496^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (123112442501) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 498049 + ... + 703048.

Almost surely, 2^123112442500 is an apocalyptic number.

123112442500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123112442500 is an abundant number, since it is smaller than the sum of its proper divisors (152676473672).

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

123112442500 is a wasteful number, since it uses less digits than its factorization.

123112442500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201162 (or 1201145 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 123112442500 its reverse (5244211321), we get a palindrome (128356653821).

The spelling of 123112442500 in words is "one hundred twenty-three billion, one hundred twelve million, four hundred forty-two thousand, five hundred".