21466718552663 has 4 divisors (see below), whose sum is σ = 21469046586888. Its totient is φ = 21464390518440.

The previous prime is 21466718552627. The next prime is 21466718552743. The reversal of 21466718552663 is 36625581766412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21466718552663 - 2⁶ = 21466718552599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21466718552596 and 21466718552605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21466718522663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1164003281 + ... + 1164021722.

It is an arithmetic number, because the mean of its divisors is an integer number (5367261646722).

Almost surely, 2^{21466718552663} is an apocalyptic number.

21466718552663 is a deficient number, since it is larger than the sum of its proper divisors (2328034225).

21466718552663 is an equidigital number, since it uses as much as digits as its factorization.

21466718552663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328034224.

The product of its digits is 87091200, while the sum is 62.

The spelling of 21466718552663 in words is "twenty-one trillion, four hundred sixty-six billion, seven hundred eighteen million, five hundred fifty-two thousand, six hundred sixty-three".