1265015266 has 8 divisors (see below), whose sum is σ = 1905397164. Its totient is φ = 629882880.

The previous prime is 1265015261. The next prime is 1265015281. The reversal of 1265015266 is 6625105621.

It can be written as a sum of positive squares in 2 ways, for example, as 1213477225 + 51538041 = 34835^2 + 7179^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1265015261) 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, 1311775 + ... + 1312738.

Almost surely, 2^1265015266 is an apocalyptic number.

1265015266 is a deficient number, since it is larger than the sum of its proper divisors (640381898).

1265015266 is a wasteful number, since it uses less digits than its factorization.

1265015266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624756.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1265015266 is about 35567.0530969323. The cubic root of 1265015266 is about 1081.5134434378.

The spelling of 1265015266 in words is "one billion, two hundred sixty-five million, fifteen thousand, two hundred sixty-six".