15666716656 has 20 divisors (see below), whose sum is σ = 32139808992. Its totient is φ = 7372572416.

The previous prime is 15666716641. The next prime is 15666716687. The reversal of 15666716656 is 65661766651.

It is a junction number, because it is equal to n+sod(n) for n = 15666716597 and 15666716606.

It is a congruent number.

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, 28798840 + ... + 28799383.

Almost surely, 2^15666716656 is an apocalyptic number.

15666716656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15666716656 is an abundant number, since it is smaller than the sum of its proper divisors (16473092336).

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

15666716656 is a wasteful number, since it uses less digits than its factorization.

15666716656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57598248 (or 57598242 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 55.

The spelling of 15666716656 in words is "fifteen billion, six hundred sixty-six million, seven hundred sixteen thousand, six hundred fifty-six".