13540631665 has 64 divisors (see below), whose sum is σ = 19120188672. Its totient is φ = 9096192000.

The previous prime is 13540631659. The next prime is 13540631693. The reversal of 13540631665 is 56613604531.

It is not a de Polignac number, because 13540631665 - 2⁵ = 13540631633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19315815 + ... + 19316515.

It is an arithmetic number, because the mean of its divisors is an integer number (298752948).

Almost surely, 2^13540631665 is an apocalyptic number.

It is an amenable number.

13540631665 is a deficient number, since it is larger than the sum of its proper divisors (5579557007).

13540631665 is a wasteful number, since it uses less digits than its factorization.

13540631665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 13540631665 in words is "thirteen billion, five hundred forty million, six hundred thirty-one thousand, six hundred sixty-five".