1266402825 has 18 divisors (see below), whose sum is σ = 2268268574. Its totient is φ = 675414720.

The previous prime is 1266402821. The next prime is 1266402853. The reversal of 1266402825 is 5282046621.

It is a happy number.

1266402825 is a `hidden beast` number, since 1 + 2 + 6 + 640 + 2 + 8 + 2 + 5 = 666.

1266402825 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1320201 + 1265082624 = 1149^2 + 35568^2 .

It is not a de Polignac number, because 1266402825 - 2² = 1266402821 is a prime.

It is a super-2 number, since 2×1266402825² = 3207552230335961250, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1266402825.

It is not an unprimeable number, because it can be changed into a prime (1266402821) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2814004 + ... + 2814453.

Almost surely, 2^1266402825 is an apocalyptic number.

1266402825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1266402825 is a deficient number, since it is larger than the sum of its proper divisors (1001865749).

1266402825 is a wasteful number, since it uses less digits than its factorization.

1266402825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628473 (or 5628465 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 1266402825 is about 35586.5539916413. The cubic root of 1266402825 is about 1081.9087259845.

The spelling of 1266402825 in words is "one billion, two hundred sixty-six million, four hundred two thousand, eight hundred twenty-five".