664465623 has 8 divisors (see below), whose sum is σ = 887297136. Its totient is φ = 442305600.

The previous prime is 664465597. The next prime is 664465657. The reversal of 664465623 is 326564466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664465623 - 2⁵ = 664465591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664465223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165558 + ... + 169523.

It is an arithmetic number, because the mean of its divisors is an integer number (110912142).

Almost surely, 2^664465623 is an apocalyptic number.

664465623 is a deficient number, since it is larger than the sum of its proper divisors (222831513).

664465623 is a wasteful number, since it uses less digits than its factorization.

664465623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335745.

The product of its digits is 622080, while the sum is 42.

The square root of 664465623 is about 25777.2307085148. The cubic root of 664465623 is about 872.6180103812.

The spelling of 664465623 in words is "six hundred sixty-four million, four hundred sixty-five thousand, six hundred twenty-three".