1265665630 has 32 divisors (see below), whose sum is σ = 2294313984. Its totient is φ = 502699776.

The previous prime is 1265665627. The next prime is 1265665631. The reversal of 1265665630 is 365665621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265665631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1060314 + ... + 1061506.

It is an arithmetic number, because the mean of its divisors is an integer number (71697312).

Almost surely, 2^1265665630 is an apocalyptic number.

1265665630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1265665630 is a deficient number, since it is larger than the sum of its proper divisors (1028648354).

1265665630 is a wasteful number, since it uses less digits than its factorization.

1265665630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 1265665630 is about 35576.1947093840. The cubic root of 1265665630 is about 1081.6987526388.

Subtracting from 1265665630 its reverse (365665621), we obtain a palindrome (900000009).

The spelling of 1265665630 in words is "one billion, two hundred sixty-five million, six hundred sixty-five thousand, six hundred thirty".