664267623 has 16 divisors (see below), whose sum is σ = 949180416. Its totient is φ = 412140960.

The previous prime is 664267621. The next prime is 664267627. The reversal of 664267623 is 326762466.

It is a happy number.

It is not a de Polignac number, because 664267623 - 2¹ = 664267621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664267621) 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, 127543 + ... + 132648.

It is an arithmetic number, because the mean of its divisors is an integer number (59323776).

Almost surely, 2^664267623 is an apocalyptic number.

664267623 is a deficient number, since it is larger than the sum of its proper divisors (284912793).

664267623 is a wasteful number, since it uses less digits than its factorization.

664267623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260254.

The product of its digits is 435456, while the sum is 42.

The square root of 664267623 is about 25773.3898236146. The cubic root of 664267623 is about 872.5313264232.

The spelling of 664267623 in words is "six hundred sixty-four million, two hundred sixty-seven thousand, six hundred twenty-three".