15661555166 has 16 divisors (see below), whose sum is σ = 24385492800. Its totient is φ = 7538520480.

The previous prime is 15661555153. The next prime is 15661555223. The reversal of 15661555166 is 66155516651.

It is a super-2 number, since 2×15661555166² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 15661555166.

It is a congruent number.

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, 1359941 + ... + 1371408.

It is an arithmetic number, because the mean of its divisors is an integer number (1524093300).

Almost surely, 2^15661555166 is an apocalyptic number.

15661555166 is a deficient number, since it is larger than the sum of its proper divisors (8723937634).

15661555166 is a wasteful number, since it uses less digits than its factorization.

15661555166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731459.

The product of its digits is 810000, while the sum is 47.

The spelling of 15661555166 in words is "fifteen billion, six hundred sixty-one million, five hundred fifty-five thousand, one hundred sixty-six".