665136253 has 4 divisors (see below), whose sum is σ = 676040188. Its totient is φ = 654232320.

The previous prime is 665136229. The next prime is 665136281. The reversal of 665136253 is 352631566.

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 257217444 + 407918809 = 16038^2 + 20197^2 .

It is not a de Polignac number, because 665136253 - 2²⁹ = 128265341 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 (665136223) 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, 5451876 + ... + 5451997.

It is an arithmetic number, because the mean of its divisors is an integer number (169010047).

Almost surely, 2^665136253 is an apocalyptic number.

It is an amenable number.

665136253 is a deficient number, since it is larger than the sum of its proper divisors (10903935).

665136253 is a wasteful number, since it uses less digits than its factorization.

665136253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10903934.

The product of its digits is 97200, while the sum is 37.

The square root of 665136253 is about 25790.2356135030. The cubic root of 665136253 is about 872.9114828242.

The spelling of 665136253 in words is "six hundred sixty-five million, one hundred thirty-six thousand, two hundred fifty-three".