1266005725 has 24 divisors (see below), whose sum is σ = 1670739048. Its totient is φ = 948326400.

The previous prime is 1266005717. The next prime is 1266005779. The reversal of 1266005725 is 5275006621.

It can be written as a sum of positive squares in 12 ways, for example, as 60388441 + 1205617284 = 7771^2 + 34722^2 .

It is not a de Polignac number, because 1266005725 - 2³ = 1266005717 is a prime.

It is a Duffinian number.

It is a congruent 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, 76165 + ... + 91285.

It is an arithmetic number, because the mean of its divisors is an integer number (69614127).

Almost surely, 2^1266005725 is an apocalyptic number.

It is an amenable number.

1266005725 is a deficient number, since it is larger than the sum of its proper divisors (404733323).

1266005725 is a wasteful number, since it uses less digits than its factorization.

1266005725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15345 (or 15340 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 1266005725 is about 35580.9741997040. The cubic root of 1266005725 is about 1081.7956311462.

The spelling of 1266005725 in words is "one billion, two hundred sixty-six million, five thousand, seven hundred twenty-five".