865669253 has 2 divisors, whose sum is σ = 865669254. Its totient is φ = 865669252.

The previous prime is 865669247. The next prime is 865669261. The reversal of 865669253 is 352966568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 801059809 + 64609444 = 28303^2 + 8038^2 .

It is a cyclic number.

It is not a de Polignac number, because 865669253 - 2²⁰ = 864620677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865669853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432834626 + 432834627.

It is an arithmetic number, because the mean of its divisors is an integer number (432834627).

Almost surely, 2^865669253 is an apocalyptic number.

It is an amenable number.

865669253 is a deficient number, since it is larger than the sum of its proper divisors (1).

865669253 is an equidigital number, since it uses as much as digits as its factorization.

865669253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 50.

The square root of 865669253 is about 29422.2577821621. The cubic root of 865669253 is about 953.0536101943.

The spelling of 865669253 in words is "eight hundred sixty-five million, six hundred sixty-nine thousand, two hundred fifty-three".