13149439665 has 32 divisors (see below), whose sum is σ = 21245214720. Its totient is φ = 6944543424.

The previous prime is 13149439651. The next prime is 13149439691. The reversal of 13149439665 is 56693494131.

It is not a de Polignac number, because 13149439665 - 2¹⁷ = 13149308593 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1035726 + ... + 1048344.

It is an arithmetic number, because the mean of its divisors is an integer number (663912960).

Almost surely, 2^13149439665 is an apocalyptic number.

13149439665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13149439665 is a deficient number, since it is larger than the sum of its proper divisors (8095775055).

13149439665 is a wasteful number, since it uses less digits than its factorization.

13149439665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13301.

The product of its digits is 2099520, while the sum is 51.

The spelling of 13149439665 in words is "thirteen billion, one hundred forty-nine million, four hundred thirty-nine thousand, six hundred sixty-five".