665626453 has 4 divisors (see below), whose sum is σ = 666072000. Its totient is φ = 665180908.

The previous prime is 665626433. The next prime is 665626457. The reversal of 665626453 is 354626566.

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 665626453 - 2⁵ = 665626421 is a prime.

It is a super-2 number, since 2×665626453² = 886117149866722418, 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 (665626457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220525 + ... + 223522.

It is an arithmetic number, because the mean of its divisors is an integer number (166518000).

Almost surely, 2^665626453 is an apocalyptic number.

It is an amenable number.

665626453 is a deficient number, since it is larger than the sum of its proper divisors (445547).

665626453 is a wasteful number, since it uses less digits than its factorization.

665626453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445546.

The product of its digits is 777600, while the sum is 43.

The square root of 665626453 is about 25799.7374599045. The cubic root of 665626453 is about 873.1258730488.

The spelling of 665626453 in words is "six hundred sixty-five million, six hundred twenty-six thousand, four hundred fifty-three".