13004651538 has 18 divisors (see below), whose sum is σ = 28177793319. Its totient is φ = 4334722572.

The previous prime is 13004651531. The next prime is 13004651563. The reversal of 13004651538 is 83515640031.

13004651538 is a `hidden beast` number, since 1 + 30 + 0 + 46 + 51 + 538 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6502325769 + 6502325769 = 80637^2 + 80637^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=80637.

It is not an unprimeable number, because it can be changed into a prime (13004651531) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 470383 + ... + 497261.

Almost surely, 2^13004651538 is an apocalyptic number.

13004651538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13004651538 is an abundant number, since it is smaller than the sum of its proper divisors (15173141781).

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

13004651538 is an frugal number, since it uses more digits than its factorization.

13004651538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53766 (or 26884 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 13004651538 in words is "thirteen billion, four million, six hundred fifty-one thousand, five hundred thirty-eight".