13491659378 has 18 divisors (see below), whose sum is σ = 21161561967. Its totient is φ = 6450725820.

The previous prime is 13491659369. The next prime is 13491659411. The reversal of 13491659378 is 87395619431.

It can be written as a sum of positive squares in only one way, i.e., 6745829689 + 6745829689 = 82133^2 + 82133^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=82133.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3776333 + ... + 3779903.

Almost surely, 2^13491659378 is an apocalyptic number.

13491659378 is a deficient number, since it is larger than the sum of its proper divisors (7669902589).

13491659378 is an frugal number, since it uses more digits than its factorization.

13491659378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7190 (or 3596 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 56.

The spelling of 13491659378 in words is "thirteen billion, four hundred ninety-one million, six hundred fifty-nine thousand, three hundred seventy-eight".