13644485887 has 2 divisors, whose sum is σ = 13644485888. Its totient is φ = 13644485886.

The previous prime is 13644485879. The next prime is 13644485927. The reversal of 13644485887 is 78858444631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13644485887 - 2³ = 13644485879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13644485807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822242943 + 6822242944.

It is an arithmetic number, because the mean of its divisors is an integer number (6822242944).

Almost surely, 2^13644485887 is an apocalyptic number.

13644485887 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644485887 is an equidigital number, since it uses as much as digits as its factorization.

13644485887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20643840, while the sum is 58.

The spelling of 13644485887 in words is "thirteen billion, six hundred forty-four million, four hundred eighty-five thousand, eight hundred eighty-seven".