1265264263 has 4 divisors (see below), whose sum is σ = 1286709480. Its totient is φ = 1243819048.

The previous prime is 1265264249. The next prime is 1265264279. The reversal of 1265264263 is 3624625621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3624625621 = 163 ⋅22236967.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1265264263 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 (1265214263) 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, 10722520 + ... + 10722637.

It is an arithmetic number, because the mean of its divisors is an integer number (321677370).

Almost surely, 2^1265264263 is an apocalyptic number.

1265264263 is a deficient number, since it is larger than the sum of its proper divisors (21445217).

1265264263 is an equidigital number, since it uses as much as digits as its factorization.

1265264263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21445216.

The product of its digits is 103680, while the sum is 37.

The square root of 1265264263 is about 35570.5533130987. The cubic root of 1265264263 is about 1081.5843980325.

Adding to 1265264263 its reverse (3624625621), we get a palindrome (4889889884).

The spelling of 1265264263 in words is "one billion, two hundred sixty-five million, two hundred sixty-four thousand, two hundred sixty-three".