21666001430653 has 8 divisors (see below), whose sum is σ = 21868587126720. Its totient is φ = 21463417581120.

The previous prime is 21666001430599. The next prime is 21666001430657. The reversal of 21666001430653 is 35603410066612.

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

It is a cyclic number.

It is not a de Polignac number, because 21666001430653 - 2⁹ = 21666001430141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21666001430657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38106088 + ... + 38670478.

It is an arithmetic number, because the mean of its divisors is an integer number (2733573390840).

Almost surely, 2^{21666001430653} is an apocalyptic number.

It is an amenable number.

21666001430653 is a deficient number, since it is larger than the sum of its proper divisors (202585696067).

21666001430653 is a wasteful number, since it uses less digits than its factorization.

21666001430653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923267.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 21666001430653 in words is "twenty-one trillion, six hundred sixty-six billion, one million, four hundred thirty thousand, six hundred fifty-three".