13644640231 has 4 divisors (see below), whose sum is σ = 13647616864. Its totient is φ = 13641663600.

The previous prime is 13644640199. The next prime is 13644640271. The reversal of 13644640231 is 13204644631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13204644631 = 821 ⋅16083611.

It is a cyclic number.

It is not a de Polignac number, because 13644640231 - 2⁵ = 13644640199 is a prime.

It is a super-2 number, since 2×13644640231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13644640271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1481430 + ... + 1490611.

It is an arithmetic number, because the mean of its divisors is an integer number (3411904216).

Almost surely, 2^13644640231 is an apocalyptic number.

13644640231 is a deficient number, since it is larger than the sum of its proper divisors (2976633).

13644640231 is an equidigital number, since it uses as much as digits as its factorization.

13644640231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2976632.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 13644640231 in words is "thirteen billion, six hundred forty-four million, six hundred forty thousand, two hundred thirty-one".