426644665 has 16 divisors (see below), whose sum is σ = 560785680. Its totient is φ = 310159360.

The previous prime is 426644593. The next prime is 426644671. The reversal of 426644665 is 566446624.

It can be written as a sum of positive squares in 8 ways, for example, as 87385104 + 339259561 = 9348^2 + 18419^2 .

It is not a de Polignac number, because 426644665 - 2²³ = 418256057 is a prime.

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, 84076 + ... + 89005.

It is an arithmetic number, because the mean of its divisors is an integer number (35049105).

Almost surely, 2^426644665 is an apocalyptic number.

It is an amenable number.

426644665 is a deficient number, since it is larger than the sum of its proper divisors (134141015).

426644665 is a wasteful number, since it uses less digits than its factorization.

426644665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173132.

The product of its digits is 829440, while the sum is 43.

The square root of 426644665 is about 20655.3785973533. The cubic root of 426644665 is about 752.8158826567.

The spelling of 426644665 in words is "four hundred twenty-six million, six hundred forty-four thousand, six hundred sixty-five".