13661566444 has 6 divisors (see below), whose sum is σ = 23907741284. Its totient is φ = 6830783220.

The previous prime is 13661566439. The next prime is 13661566453. The reversal of 13661566444 is 44466516631.

It is a junction number, because it is equal to n+sod(n) for n = 13661566394 and 13661566403.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1707695802 + ... + 1707695809.

Almost surely, 2^13661566444 is an apocalyptic number.

It is an amenable number.

13661566444 is a deficient number, since it is larger than the sum of its proper divisors (10246174840).

13661566444 is a wasteful number, since it uses less digits than its factorization.

13661566444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3415391615 (or 3415391613 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 46.

The spelling of 13661566444 in words is "thirteen billion, six hundred sixty-one million, five hundred sixty-six thousand, four hundred forty-four".