1266001225 has 6 divisors (see below), whose sum is σ = 1569841550. Its totient is φ = 1012800960.

The previous prime is 1266001211. The next prime is 1266001283. The reversal of 1266001225 is 5221006621.

It can be written as a sum of positive squares in 3 ways, for example, as 21040569 + 1244960656 = 4587^2 + 35284^2 .

It is not a de Polignac number, because 1266001225 - 2⁵ = 1266001193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 50640049 = 1266001225 / (1 + 2 + 6 + 6 + 0 + 0 + 1 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1266001225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25320000 + ... + 25320049.

Almost surely, 2^1266001225 is an apocalyptic number.

It is an amenable number.

1266001225 is a deficient number, since it is larger than the sum of its proper divisors (303840325).

1266001225 is an equidigital number, since it uses as much as digits as its factorization.

1266001225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50640059 (or 50640054 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1266001225 is about 35580.9109636052. The cubic root of 1266001225 is about 1081.7943494021.

Adding to 1266001225 its reverse (5221006621), we get a palindrome (6487007846).

The spelling of 1266001225 in words is "one billion, two hundred sixty-six million, one thousand, two hundred twenty-five".