15661404244 has 12 divisors (see below), whose sum is σ = 27457566304. Its totient is φ = 7816385304.

The previous prime is 15661404223. The next prime is 15661404287. The reversal of 15661404244 is 44240416651.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3576744 + ... + 3581119.

Almost surely, 2^15661404244 is an apocalyptic number.

It is an amenable number.

15661404244 is a deficient number, since it is larger than the sum of its proper divisors (11796162060).

15661404244 is a wasteful number, since it uses less digits than its factorization.

15661404244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7158414 (or 7158412 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

The spelling of 15661404244 in words is "fifteen billion, six hundred sixty-one million, four hundred four thousand, two hundred forty-four".