13640811466 has 4 divisors (see below), whose sum is σ = 20461217202. Its totient is φ = 6820405732.

The previous prime is 13640811391. The next prime is 13640811469. The reversal of 13640811466 is 66411804631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66411804631 = 17 ⋅3906576743.

It can be written as a sum of positive squares in only one way, i.e., 7018920841 + 6621890625 = 83779^2 + 81375^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (13640811469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410202865 + ... + 3410202868.

Almost surely, 2^13640811466 is an apocalyptic number.

13640811466 is a deficient number, since it is larger than the sum of its proper divisors (6820405736).

13640811466 is an equidigital number, since it uses as much as digits as its factorization.

13640811466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6820405735.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 13640811466 in words is "thirteen billion, six hundred forty million, eight hundred eleven thousand, four hundred sixty-six".