664253253 has 6 divisors (see below), whose sum is σ = 959476934. Its totient is φ = 442835496.

The previous prime is 664253237. The next prime is 664253269. The reversal of 664253253 is 352352466.

664253253 is a `hidden beast` number, since 6 + 642 + 5 + 3 + 2 + 5 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (664253237) and next prime (664253269).

It can be written as a sum of positive squares in only one way, i.e., 510443649 + 153809604 = 22593^2 + 12402^2 .

It is not a de Polignac number, because 664253253 - 2⁴ = 664253237 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 (664253203) 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 5 ways as a sum of consecutive naturals, for example, 36902950 + ... + 36902967.

Almost surely, 2^664253253 is an apocalyptic number.

It is an amenable number.

664253253 is a deficient number, since it is larger than the sum of its proper divisors (295223681).

664253253 is a wasteful number, since it uses less digits than its factorization.

664253253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73805923 (or 73805920 counting only the distinct ones).

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

The square root of 664253253 is about 25773.1110462047. Note that the first 3 decimals coincide. The cubic root of 664253253 is about 872.5250345988.

It can be divided in two parts, 6642 and 53253, that added together give a palindrome (59895).

The spelling of 664253253 in words is "six hundred sixty-four million, two hundred fifty-three thousand, two hundred fifty-three".