664457069 has 4 divisors (see below), whose sum is σ = 685891200. Its totient is φ = 643022940.

The previous prime is 664457047. The next prime is 664457099. The reversal of 664457069 is 960754466.

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 a de Polignac number, because none of the positive numbers 2^k-664457069 is a prime.

It is a super-2 number, since 2×664457069² = 883006393088141522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664457009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10717019 + ... + 10717080.

It is an arithmetic number, because the mean of its divisors is an integer number (171472800).

Almost surely, 2^664457069 is an apocalyptic number.

It is an amenable number.

664457069 is a deficient number, since it is larger than the sum of its proper divisors (21434131).

664457069 is a wasteful number, since it uses less digits than its factorization.

664457069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21434130.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The square root of 664457069 is about 25777.0647863561. The cubic root of 664457069 is about 872.6142658151.

The spelling of 664457069 in words is "six hundred sixty-four million, four hundred fifty-seven thousand, sixty-nine".