21660366264166 has 8 divisors (see below), whose sum is σ = 37132056452880. Its totient is φ = 9283014113208.

The previous prime is 21660366264157. The next prime is 21660366264191. The reversal of 21660366264166 is 66146266306612.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 773584509421 + ... + 773584509448.

It is an arithmetic number, because the mean of its divisors is an integer number (4641507056610).

Almost surely, 2^{21660366264166} is an apocalyptic number.

21660366264166 is a deficient number, since it is larger than the sum of its proper divisors (15471690188714).

21660366264166 is a wasteful number, since it uses less digits than its factorization.

21660366264166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547169018878.

The product of its (nonzero) digits is 13436928, while the sum is 55.

The spelling of 21660366264166 in words is "twenty-one trillion, six hundred sixty billion, three hundred sixty-six million, two hundred sixty-four thousand, one hundred sixty-six".