665072453 has 4 divisors (see below), whose sum is σ = 704194380. Its totient is φ = 625950528.

The previous prime is 665072431. The next prime is 665072477. The reversal of 665072453 is 354270566.

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 411562369 + 253510084 = 20287^2 + 15922^2 .

It is a cyclic number.

It is not a de Polignac number, because 665072453 - 2⁶ = 665072389 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 (665072153) 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, 19560938 + ... + 19560971.

It is an arithmetic number, because the mean of its divisors is an integer number (176048595).

Almost surely, 2^665072453 is an apocalyptic number.

It is an amenable number.

665072453 is a deficient number, since it is larger than the sum of its proper divisors (39121927).

665072453 is a wasteful number, since it uses less digits than its factorization.

665072453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39121926.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 665072453 is about 25788.9986816084. The cubic root of 665072453 is about 872.8835719849.

The spelling of 665072453 in words is "six hundred sixty-five million, seventy-two thousand, four hundred fifty-three".