426664638918 has 160 divisors (see below), whose sum is σ = 1116482875200. Its totient is φ = 119255535360.

The previous prime is 426664638871. The next prime is 426664638949. The reversal of 426664638918 is 819836466624.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 20965428 + ... + 20985768.

It is an arithmetic number, because the mean of its divisors is an integer number (6978017970).

Almost surely, 2^426664638918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 426664638918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (558241437600).

426664638918 is an abundant number, since it is smaller than the sum of its proper divisors (689818236282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

426664638918 is a wasteful number, since it uses less digits than its factorization.

426664638918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20764 (or 20755 counting only the distinct ones).

The product of its digits is 71663616, while the sum is 63.

The spelling of 426664638918 in words is "four hundred twenty-six billion, six hundred sixty-four million, six hundred thirty-eight thousand, nine hundred eighteen".