13640810187 has 4 divisors (see below), whose sum is σ = 18187746920. Its totient is φ = 9093873456.

The previous prime is 13640810171. The next prime is 13640810219. The reversal of 13640810187 is 78101804631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78101804631 = 3 ⋅26033934877.

It is not a de Polignac number, because 13640810187 - 2⁴ = 13640810171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13640811187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2273468362 + ... + 2273468367.

It is an arithmetic number, because the mean of its divisors is an integer number (4546936730).

Almost surely, 2^13640810187 is an apocalyptic number.

13640810187 is a deficient number, since it is larger than the sum of its proper divisors (4546936733).

13640810187 is an equidigital number, since it uses as much as digits as its factorization.

13640810187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546936732.

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 13640810187 in words is "thirteen billion, six hundred forty million, eight hundred ten thousand, one hundred eighty-seven".