13123133440 has 56 divisors (see below), whose sum is σ = 31493696220. Its totient is φ = 5249236992.

The previous prime is 13123133431. The next prime is 13123133453. The reversal of 13123133440 is 4433132131.

It can be written as a sum of positive squares in 2 ways, for example, as 12817862656 + 305270784 = 113216^2 + 17472^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119235 + ... + 201154.

Almost surely, 2^13123133440 is an apocalyptic number.

13123133440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13123133440 is an abundant number, since it is smaller than the sum of its proper divisors (18370562780).

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

13123133440 is an frugal number, since it uses more digits than its factorization.

13123133440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320420 (or 320396 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 13123133440 its reverse (4433132131), we get a palindrome (17556265571).

The spelling of 13123133440 in words is "thirteen billion, one hundred twenty-three million, one hundred thirty-three thousand, four hundred forty".