1266564144 has 20 divisors (see below), whose sum is σ = 3271957496. Its totient is φ = 422188032.

The previous prime is 1266564137. The next prime is 1266564157. The reversal of 1266564144 is 4414656621.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13193329 + ... + 13193424.

Almost surely, 2^1266564144 is an apocalyptic number.

It is an amenable number.

1266564144 is an abundant number, since it is smaller than the sum of its proper divisors (2005393352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266564144 is a wasteful number, since it uses less digits than its factorization.

1266564144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26386764 (or 26386758 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The square root of 1266564144 is about 35588.8204918342. The cubic root of 1266564144 is about 1081.9546631908.

The spelling of 1266564144 in words is "one billion, two hundred sixty-six million, five hundred sixty-four thousand, one hundred forty-four".