264640253 has 4 divisors (see below), whose sum is σ = 264922428. Its totient is φ = 264358080.

The previous prime is 264640247. The next prime is 264640267. The reversal of 264640253 is 352046462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 352046462 = 2 ⋅176023231.

It can be written as a sum of positive squares in 2 ways, for example, as 166590649 + 98049604 = 12907^2 + 9902^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264640253 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 (264640213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139676 + ... + 141557.

It is an arithmetic number, because the mean of its divisors is an integer number (66230607).

Almost surely, 2^264640253 is an apocalyptic number.

It is an amenable number.

264640253 is a deficient number, since it is larger than the sum of its proper divisors (282175).

264640253 is an equidigital number, since it uses as much as digits as its factorization.

264640253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282174.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 264640253 is about 16267.7673022453. The cubic root of 264640253 is about 642.0250416438.

The spelling of 264640253 in words is "two hundred sixty-four million, six hundred forty thousand, two hundred fifty-three".