1266641225 has 6 divisors (see below), whose sum is σ = 1570635150. Its totient is φ = 1013312960.

The previous prime is 1266641191. The next prime is 1266641237. The reversal of 1266641225 is 5221466621.

It can be written as a sum of positive squares in 3 ways, for example, as 91317136 + 1175324089 = 9556^2 + 34283^2 .

It is not a de Polignac number, because 1266641225 - 2¹⁴ = 1266624841 is a prime.

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, 25332800 + ... + 25332849.

It is an arithmetic number, because the mean of its divisors is an integer number (261772525).

Almost surely, 2^1266641225 is an apocalyptic number.

It is an amenable number.

1266641225 is a deficient number, since it is larger than the sum of its proper divisors (303993925).

1266641225 is an equidigital number, since it uses as much as digits as its factorization.

1266641225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50665659 (or 50665654 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 1266641225 is about 35589.9034137492. The cubic root of 1266641225 is about 1081.9766114030.

The spelling of 1266641225 in words is "one billion, two hundred sixty-six million, six hundred forty-one thousand, two hundred twenty-five".