15601661106666 has 64 divisors (see below), whose sum is σ = 31986285281280. Its totient is φ = 5070499801920.

The previous prime is 15601661106659. The next prime is 15601661106737. The reversal of 15601661106666 is 66660116610651.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 499541271 + ... + 499572501.

It is an arithmetic number, because the mean of its divisors is an integer number (499785707520).

Almost surely, 2^{15601661106666} is an apocalyptic number.

15601661106666 is an abundant number, since it is smaller than the sum of its proper divisors (16384624174614).

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

15601661106666 is a wasteful number, since it uses less digits than its factorization.

15601661106666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34691.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 15601661106666 in words is "fifteen trillion, six hundred one billion, six hundred sixty-one million, one hundred six thousand, six hundred sixty-six".