21662826166 has 8 divisors (see below), whose sum is σ = 32494909680. Its totient is φ = 10831189608.

The previous prime is 21662826151. The next prime is 21662826167. The reversal of 21662826166 is 66162826612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21662826167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65935 + ... + 218341.

It is an arithmetic number, because the mean of its divisors is an integer number (4061863710).

Almost surely, 2^21662826166 is an apocalyptic number.

21662826166 is a deficient number, since it is larger than the sum of its proper divisors (10832083514).

21662826166 is a wasteful number, since it uses less digits than its factorization.

21662826166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223478.

The product of its digits is 497664, while the sum is 46.

The spelling of 21662826166 in words is "twenty-one billion, six hundred sixty-two million, eight hundred twenty-six thousand, one hundred sixty-six".