13611444640 has 48 divisors (see below), whose sum is σ = 33265912680. Its totient is φ = 5256832000.

The previous prime is 13611444607. The next prime is 13611444653. The reversal of 13611444640 is 4644411631.

It can be written as a sum of positive squares in 4 ways, for example, as 9030320784 + 4581123856 = 95028^2 + 67684^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13611444596 and 13611444605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1462111 + ... + 1471390.

Almost surely, 2^13611444640 is an apocalyptic number.

13611444640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13611444640 is an abundant number, since it is smaller than the sum of its proper divisors (19654468040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13611444640 is a wasteful number, since it uses less digits than its factorization.

13611444640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2933545 (or 2933537 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 13611444640 in words is "thirteen billion, six hundred eleven million, four hundred forty-four thousand, six hundred forty".