1265187265 has 8 divisors (see below), whose sum is σ = 1519833600. Its totient is φ = 1011077232.

The previous prime is 1265187241. The next prime is 1265187281. The reversal of 1265187265 is 5627815621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1265187265 - 2⁷ = 1265187137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128865 + ... + 138334.

It is an arithmetic number, because the mean of its divisors is an integer number (189979200).

Almost surely, 2^1265187265 is an apocalyptic number.

It is an amenable number.

1265187265 is a deficient number, since it is larger than the sum of its proper divisors (254646335).

1265187265 is an equidigital number, since it uses as much as digits as its factorization.

1265187265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268151.

The product of its digits is 201600, while the sum is 43.

The square root of 1265187265 is about 35569.4709687957. The cubic root of 1265187265 is about 1081.5624575501.

The spelling of 1265187265 in words is "one billion, two hundred sixty-five million, one hundred eighty-seven thousand, two hundred sixty-five".