15661661156 has 24 divisors (see below), whose sum is σ = 28771572480. Its totient is φ = 7449775200.

The previous prime is 15661661153. The next prime is 15661661177. The reversal of 15661661156 is 65116616651.

It is not an unprimeable number, because it can be changed into a prime (15661661153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1063055 + ... + 1077686.

It is an arithmetic number, because the mean of its divisors is an integer number (1198815520).

Almost surely, 2^15661661156 is an apocalyptic number.

It is an amenable number.

15661661156 is a deficient number, since it is larger than the sum of its proper divisors (13109911324).

15661661156 is a wasteful number, since it uses less digits than its factorization.

15661661156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2140835 (or 2140833 counting only the distinct ones).

The product of its digits is 194400, while the sum is 44.

The spelling of 15661661156 in words is "fifteen billion, six hundred sixty-one million, six hundred sixty-one thousand, one hundred fifty-six".