1266906133 has 4 divisors (see below), whose sum is σ = 1287675148. Its totient is φ = 1246137120.

The previous prime is 1266906127. The next prime is 1266906211. The reversal of 1266906133 is 3316096621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3316096621 = 37 ⋅89624233.

It can be written as a sum of positive squares in 2 ways, for example, as 733434724 + 533471409 = 27082^2 + 23097^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266906133 - 2⁵ = 1266906101 is a prime.

It is a super-2 number, since 2×1266906133² = 3210102299666027378, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1266906092 and 1266906101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266906533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10384416 + ... + 10384537.

It is an arithmetic number, because the mean of its divisors is an integer number (321918787).

Almost surely, 2^1266906133 is an apocalyptic number.

It is an amenable number.

1266906133 is a deficient number, since it is larger than the sum of its proper divisors (20769015).

1266906133 is an equidigital number, since it uses as much as digits as its factorization.

1266906133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20769014.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 1266906133 is about 35593.6248926686. The cubic root of 1266906133 is about 1082.0520350970.

The spelling of 1266906133 in words is "one billion, two hundred sixty-six million, nine hundred six thousand, one hundred thirty-three".