426561666 has 32 divisors (see below), whose sum is σ = 905999040. Its totient is φ = 133507584.

The previous prime is 426561617. The next prime is 426561673. The reversal of 426561666 is 666165624.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3675 + ... + 29438.

It is an arithmetic number, because the mean of its divisors is an integer number (28312470).

Almost surely, 2^426561666 is an apocalyptic number.

426561666 is an abundant number, since it is smaller than the sum of its proper divisors (479437374).

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

426561666 is a wasteful number, since it uses less digits than its factorization.

426561666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33250.

The product of its digits is 311040, while the sum is 42.

The square root of 426561666 is about 20653.3693619225. The cubic root of 426561666 is about 752.7670621567.

The spelling of 426561666 in words is "four hundred twenty-six million, five hundred sixty-one thousand, six hundred sixty-six".