1266421825 has 12 divisors (see below), whose sum is σ = 1571005228. Its totient is φ = 1012723200.

The previous prime is 1266421823. The next prime is 1266421831. The reversal of 1266421825 is 5281246621.

It can be written as a sum of positive squares in 6 ways, for example, as 83887281 + 1182534544 = 9159^2 + 34388^2 .

It is not a de Polignac number, because 1266421825 - 2¹ = 1266421823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266421823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61885 + ... + 79765.

Almost surely, 2^1266421825 is an apocalyptic number.

It is an amenable number.

1266421825 is a deficient number, since it is larger than the sum of its proper divisors (304583403).

1266421825 is a wasteful number, since it uses less digits than its factorization.

1266421825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20724 (or 20719 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 1266421825 is about 35586.8209454006. The cubic root of 1266421825 is about 1081.9141366281.

The spelling of 1266421825 in words is "one billion, two hundred sixty-six million, four hundred twenty-one thousand, eight hundred twenty-five".