13644444631 has 4 divisors (see below), whose sum is σ = 13817159200. Its totient is φ = 13471730064.

The previous prime is 13644444599. The next prime is 13644444643.

13644444631 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13644444631 - 2⁵ = 13644444599 is a prime.

It is a super-2 number, since 2×13644444631² (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 (13644444691) 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, 86357166 + ... + 86357323.

It is an arithmetic number, because the mean of its divisors is an integer number (3454289800).

Almost surely, 2^13644444631 is an apocalyptic number.

13644444631 is a deficient number, since it is larger than the sum of its proper divisors (172714569).

13644444631 is an equidigital number, since it uses as much as digits as its factorization.

13644444631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172714568.

The product of its digits is 331776, while the sum is 40.

The spelling of 13644444631 in words is "thirteen billion, six hundred forty-four million, four hundred forty-four thousand, six hundred thirty-one".