426620805721 has 16 divisors (see below), whose sum is σ = 492989077440. Its totient is φ = 364869204480.

The previous prime is 426620805713. The next prime is 426620805731. The reversal of 426620805721 is 127508026624.

It is a happy number.

It is not a de Polignac number, because 426620805721 - 2³ = 426620805713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (426620805731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35391 + ... + 924388.

It is an arithmetic number, because the mean of its divisors is an integer number (30811817340).

Almost surely, 2^426620805721 is an apocalyptic number.

It is an amenable number.

426620805721 is a deficient number, since it is larger than the sum of its proper divisors (66368271719).

426620805721 is a wasteful number, since it uses less digits than its factorization.

426620805721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962184.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 426620805721 in words is "four hundred twenty-six billion, six hundred twenty million, eight hundred five thousand, seven hundred twenty-one".