426666564633623 has 4 divisors (see below), whose sum is σ = 449122699614360. Its totient is φ = 404210429652888.

The previous prime is 426666564633587. The next prime is 426666564633719. The reversal of 426666564633623 is 326336465666624.

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 426666564633623 - 2³⁰ = 426665490891799 is a prime.

It is a super-2 number, since 2×426666564633623² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426666564638623) 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, 11228067490340 + ... + 11228067490377.

It is an arithmetic number, because the mean of its divisors is an integer number (112280674903590).

Almost surely, 2^{426666564633623} is an apocalyptic number.

426666564633623 is a deficient number, since it is larger than the sum of its proper divisors (22456134980737).

426666564633623 is a wasteful number, since it uses less digits than its factorization.

426666564633623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22456134980736.

The product of its digits is 2418647040, while the sum is 68.

The spelling of 426666564633623 in words is "four hundred twenty-six trillion, six hundred sixty-six billion, five hundred sixty-four million, six hundred thirty-three thousand, six hundred twenty-three".