1264795566 has 16 divisors (see below), whose sum is σ = 2545112064. Its totient is φ = 419011704.

The previous prime is 1264795559. The next prime is 1264795603. The reversal of 1264795566 is 6655974621.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645646 + ... + 647601.

It is an arithmetic number, because the mean of its divisors is an integer number (159069504).

Almost surely, 2^1264795566 is an apocalyptic number.

1264795566 is an abundant number, since it is smaller than the sum of its proper divisors (1280316498).

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

1264795566 is a wasteful number, since it uses less digits than its factorization.

1264795566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293415.

The product of its digits is 2721600, while the sum is 51.

The square root of 1264795566 is about 35563.9644303050. The cubic root of 1264795566 is about 1081.4508296321.

The spelling of 1264795566 in words is "one billion, two hundred sixty-four million, seven hundred ninety-five thousand, five hundred sixty-six".