2564646266 has 16 divisors (see below), whose sum is σ = 4734731904. Its totient is φ = 1014585264.

The previous prime is 2564646251. The next prime is 2564646281. The reversal of 2564646266 is 6626464652.

It is an interprime number because it is at equal distance from previous prime (2564646251) and next prime (2564646281).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2564646266.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7045550 + ... + 7045913.

It is an arithmetic number, because the mean of its divisors is an integer number (295920744).

Almost surely, 2^2564646266 is an apocalyptic number.

2564646266 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2564646266 is a deficient number, since it is larger than the sum of its proper divisors (2170085638).

2564646266 is a wasteful number, since it uses less digits than its factorization.

2564646266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14091485.

The product of its digits is 2488320, while the sum is 47.

The square root of 2564646266 is about 50642.3366956937. The cubic root of 2564646266 is about 1368.8078616491.

The spelling of 2564646266 in words is "two billion, five hundred sixty-four million, six hundred forty-six thousand, two hundred sixty-six".