664734669 has 4 divisors (see below), whose sum is σ = 886312896. Its totient is φ = 443156444.

The previous prime is 664734659. The next prime is 664734673. The reversal of 664734669 is 966437466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664734669 - 2⁷ = 664734541 is a prime.

It is a super-2 number, since 2×664734669² = 883744360341079122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664734619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110789109 + ... + 110789114.

It is an arithmetic number, because the mean of its divisors is an integer number (221578224).

Almost surely, 2^664734669 is an apocalyptic number.

It is an amenable number.

664734669 is a deficient number, since it is larger than the sum of its proper divisors (221578227).

664734669 is a wasteful number, since it uses less digits than its factorization.

664734669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221578226.

The product of its digits is 3919104, while the sum is 51.

The square root of 664734669 is about 25782.4488557623. The cubic root of 664734669 is about 872.7357705267.

The spelling of 664734669 in words is "six hundred sixty-four million, seven hundred thirty-four thousand, six hundred sixty-nine".