1266064885 has 16 divisors (see below), whose sum is σ = 1609542576. Its totient is φ = 952741888.

The previous prime is 1266064879. The next prime is 1266064913. The reversal of 1266064885 is 5884606621.

It can be written as a sum of positive squares in 8 ways, for example, as 140730769 + 1125334116 = 11863^2 + 33546^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266064885 - 2¹⁷ = 1265933813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220977 + ... + 226633.

It is an arithmetic number, because the mean of its divisors is an integer number (100596411).

Almost surely, 2^1266064885 is an apocalyptic number.

It is an amenable number.

1266064885 is a deficient number, since it is larger than the sum of its proper divisors (343477691).

1266064885 is a wasteful number, since it uses less digits than its factorization.

1266064885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8312.

The product of its (nonzero) digits is 552960, while the sum is 46.

The square root of 1266064885 is about 35581.8055331654. The cubic root of 1266064885 is about 1081.8124815262.

The spelling of 1266064885 in words is "one billion, two hundred sixty-six million, sixty-four thousand, eight hundred eighty-five".