2566664263 has 4 divisors (see below), whose sum is σ = 2567288520. Its totient is φ = 2566040008.

The previous prime is 2566664239. The next prime is 2566664273. The reversal of 2566664263 is 3624666652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2566664263 - 2⁹ = 2566663751 is a prime.

It is a super-2 number, since 2×2566664263² = 13175530877922666338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566664203) 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, 305920 + ... + 314197.

It is an arithmetic number, because the mean of its divisors is an integer number (641822130).

Almost surely, 2^2566664263 is an apocalyptic number.

2566664263 is a deficient number, since it is larger than the sum of its proper divisors (624257).

2566664263 is an equidigital number, since it uses as much as digits as its factorization.

2566664263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624256.

The product of its digits is 1866240, while the sum is 46.

The square root of 2566664263 is about 50662.2567894483. The cubic root of 2566664263 is about 1369.1667839194.

The spelling of 2566664263 in words is "two billion, five hundred sixty-six million, six hundred sixty-four thousand, two hundred sixty-three".