123661280920 has 32 divisors (see below), whose sum is σ = 282390692400. Its totient is φ = 48726235008.

The previous prime is 123661280903. The next prime is 123661280921. The reversal of 123661280920 is 29082166321.

It is a super-2 number, since 2×123661280920² (a number of 23 digits) contains 22 as substring.

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 (123661280921) 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, 23068455 + ... + 23073814.

Almost surely, 2^123661280920 is an apocalyptic number.

123661280920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123661280920 is an abundant number, since it is smaller than the sum of its proper divisors (158729411480).

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

123661280920 is a wasteful number, since it uses less digits than its factorization.

123661280920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46142347 (or 46142343 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 123661280920 in words is "one hundred twenty-three billion, six hundred sixty-one million, two hundred eighty thousand, nine hundred twenty".