15166661661 has 12 divisors (see below), whose sum is σ = 22184710080. Its totient is φ = 9983118600.

The previous prime is 15166661659. The next prime is 15166661677. The reversal of 15166661661 is 16616666151.

It is not a de Polignac number, because 15166661661 - 2¹ = 15166661659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15166661651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10665015 + ... + 10666436.

It is an arithmetic number, because the mean of its divisors is an integer number (1848725840).

Almost surely, 2^15166661661 is an apocalyptic number.

It is an amenable number.

15166661661 is a deficient number, since it is larger than the sum of its proper divisors (7018048419).

15166661661 is a wasteful number, since it uses less digits than its factorization.

15166661661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21331536 (or 21331533 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 15166661661 in words is "fifteen billion, one hundred sixty-six million, six hundred sixty-one thousand, six hundred sixty-one".