664664453 has 12 divisors (see below), whose sum is σ = 707007492. Its totient is φ = 624729600.

The previous prime is 664664449. The next prime is 664664471. The reversal of 664664453 is 354466466.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 18335524 + 646328929 = 4282^2 + 25423^2 .

It is not a de Polignac number, because 664664453 - 2² = 664664449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664667453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368153 + ... + 369953.

It is an arithmetic number, because the mean of its divisors is an integer number (58917291).

Almost surely, 2^664664453 is an apocalyptic number.

It is an amenable number.

664664453 is a deficient number, since it is larger than the sum of its proper divisors (42343039).

664664453 is a wasteful number, since it uses less digits than its factorization.

664664453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112 (or 3095 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 44.

The square root of 664664453 is about 25781.0871182733. The cubic root of 664664453 is about 872.7050403845.

The spelling of 664664453 in words is "six hundred sixty-four million, six hundred sixty-four thousand, four hundred fifty-three".