665253423 has 12 divisors (see below), whose sum is σ = 963220440. Its totient is φ = 442441296.

The previous prime is 665253419. The next prime is 665253427. The reversal of 665253423 is 324352566.

It is an interprime number because it is at equal distance from previous prime (665253419) and next prime (665253427).

It is not a de Polignac number, because 665253423 - 2² = 665253419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665253427) 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 11 ways as a sum of consecutive naturals, for example, 84436 + ... + 91977.

It is an arithmetic number, because the mean of its divisors is an integer number (80268370).

Almost surely, 2^665253423 is an apocalyptic number.

665253423 is a deficient number, since it is larger than the sum of its proper divisors (297967017).

665253423 is a wasteful number, since it uses less digits than its factorization.

665253423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176838 (or 176835 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

The square root of 665253423 is about 25792.5071096239. The cubic root of 665253423 is about 872.9627370010.

The spelling of 665253423 in words is "six hundred sixty-five million, two hundred fifty-three thousand, four hundred twenty-three".