664717453 has 4 divisors (see below), whose sum is σ = 664837468. Its totient is φ = 664597440.

The previous prime is 664717447. The next prime is 664717477. The reversal of 664717453 is 354717466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 576864324 + 87853129 = 24018^2 + 9373^2 .

It is a cyclic number.

It is not a de Polignac number, because 664717453 - 2⁵ = 664717421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664712453) 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, 51276 + ... + 62917.

It is an arithmetic number, because the mean of its divisors is an integer number (166209367).

Almost surely, 2^664717453 is an apocalyptic number.

It is an amenable number.

664717453 is a deficient number, since it is larger than the sum of its proper divisors (120015).

664717453 is a wasteful number, since it uses less digits than its factorization.

664717453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120014.

The product of its digits is 423360, while the sum is 43.

The square root of 664717453 is about 25782.1149830653. The cubic root of 664717453 is about 872.7282361176.

The spelling of 664717453 in words is "six hundred sixty-four million, seven hundred seventeen thousand, four hundred fifty-three".