21663024323566 has 8 divisors (see below), whose sum is σ = 32620974371280. Its totient is φ = 10789366199808.

The previous prime is 21663024323557. The next prime is 21663024323573. The reversal of 21663024323566 is 66532342036612.

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, 21072980346 + ... + 21072981373.

It is an arithmetic number, because the mean of its divisors is an integer number (4077621796410).

Almost surely, 2^{21663024323566} is an apocalyptic number.

21663024323566 is a deficient number, since it is larger than the sum of its proper divisors (10957950047714).

21663024323566 is a wasteful number, since it uses less digits than its factorization.

21663024323566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42145961978.

The product of its (nonzero) digits is 5598720, while the sum is 49.

The spelling of 21663024323566 in words is "twenty-one trillion, six hundred sixty-three billion, twenty-four million, three hundred twenty-three thousand, five hundred sixty-six".