13389660538 has 4 divisors (see below), whose sum is σ = 20084490810. Its totient is φ = 6694830268.

The previous prime is 13389660497. The next prime is 13389660539. The reversal of 13389660538 is 83506698331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12471752329 + 917908209 = 111677^2 + 30297^2 .

It is not an unprimeable number, because it can be changed into a prime (13389660539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3347415133 + ... + 3347415136.

Almost surely, 2^13389660538 is an apocalyptic number.

13389660538 is a deficient number, since it is larger than the sum of its proper divisors (6694830272).

13389660538 is an equidigital number, since it uses as much as digits as its factorization.

13389660538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6694830271.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 13389660538 in words is "thirteen billion, three hundred eighty-nine million, six hundred sixty thousand, five hundred thirty-eight".