21975376166 has 8 divisors (see below), whose sum is σ = 33222616320. Its totient is φ = 10901170728.

The previous prime is 21975376141. The next prime is 21975376183. The reversal of 21975376166 is 66167357912.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43258361 + ... + 43258868.

It is an arithmetic number, because the mean of its divisors is an integer number (4152827040).

Almost surely, 2^21975376166 is an apocalyptic number.

21975376166 is a deficient number, since it is larger than the sum of its proper divisors (11247240154).

21975376166 is a wasteful number, since it uses less digits than its factorization.

21975376166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86517358.

The product of its digits is 2857680, while the sum is 53.

The spelling of 21975376166 in words is "twenty-one billion, nine hundred seventy-five million, three hundred seventy-six thousand, one hundred sixty-six".