1265630265 has 24 divisors (see below), whose sum is σ = 2275011648. Its totient is φ = 675002160.

The previous prime is 1265630213. The next prime is 1265630279. The reversal of 1265630265 is 5620365621.

It is a happy number.

1265630265 is a `hidden beast` number, since 12 + 6 + 5 + 630 + 2 + 6 + 5 = 666.

It is not a de Polignac number, because 1265630265 - 2²⁴ = 1248853049 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 519621 + ... + 522050.

It is an arithmetic number, because the mean of its divisors is an integer number (94792152).

Almost surely, 2^1265630265 is an apocalyptic number.

1265630265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1265630265 is a deficient number, since it is larger than the sum of its proper divisors (1009381383).

1265630265 is an equidigital number, since it uses as much as digits as its factorization.

1265630265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041691 (or 1041679 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 1265630265 is about 35575.6976741146. The cubic root of 1265630265 is about 1081.6886776680.

Adding to 1265630265 its reverse (5620365621), we get a palindrome (6885995886).

The spelling of 1265630265 in words is "one billion, two hundred sixty-five million, six hundred thirty thousand, two hundred sixty-five".