15661650156 has 12 divisors (see below), whose sum is σ = 36543850392. Its totient is φ = 5220550048.

The previous prime is 15661650139. The next prime is 15661650227. The reversal of 15661650156 is 65105616651.

It is a tau number, because it is divible by the number of its divisors (12).

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, 652568745 + ... + 652568768.

It is an arithmetic number, because the mean of its divisors is an integer number (3045320866).

Almost surely, 2^15661650156 is an apocalyptic number.

It is an amenable number.

15661650156 is an abundant number, since it is smaller than the sum of its proper divisors (20882200236).

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

15661650156 is a wasteful number, since it uses less digits than its factorization.

15661650156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305137520 (or 1305137518 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 15661650156 in words is "fifteen billion, six hundred sixty-one million, six hundred fifty thousand, one hundred fifty-six".