13120868538 has 32 divisors (see below), whose sum is σ = 29336385600. Its totient is φ = 4346787888.

The previous prime is 13120868507. The next prime is 13120868539. The reversal of 13120868538 is 83586802131.

13120868538 is a `hidden beast` number, since 1 + 31 + 2 + 0 + 86 + 8 + 538 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 13120868493 and 13120868502.

It is not an unprimeable number, because it can be changed into a prime (13120868539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736533 + ... + 754136.

It is an arithmetic number, because the mean of its divisors is an integer number (916762050).

Almost surely, 2^13120868538 is an apocalyptic number.

13120868538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13120868538 is an abundant number, since it is smaller than the sum of its proper divisors (16215517062).

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

13120868538 is a wasteful number, since it uses less digits than its factorization.

13120868538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490843 (or 1490837 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 13120868538 in words is "thirteen billion, one hundred twenty million, eight hundred sixty-eight thousand, five hundred thirty-eight".