1265530023 has 12 divisors (see below), whose sum is σ = 1828332688. Its totient is φ = 843527520.

The previous prime is 1265530009. The next prime is 1265530027. The reversal of 1265530023 is 3200355621.

1265530023 is a `hidden beast` number, since 1 + 2 + 655 + 3 + 0 + 0 + 2 + 3 = 666.

It is not a de Polignac number, because 1265530023 - 2⁶ = 1265529959 is a prime.

It is a super-2 number, since 2×1265530023² = 3203132478228761058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265530027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56286 + ... + 75492.

Almost surely, 2^1265530023 is an apocalyptic number.

1265530023 is a deficient number, since it is larger than the sum of its proper divisors (562802665).

1265530023 is a wasteful number, since it uses less digits than its factorization.

1265530023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26534 (or 26531 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 1265530023 is about 35574.2887912042. The cubic root of 1265530023 is about 1081.6601191697.

Adding to 1265530023 its reverse (3200355621), we get a palindrome (4465885644).

The spelling of 1265530023 in words is "one billion, two hundred sixty-five million, five hundred thirty thousand, twenty-three".