2566478663 has 16 divisors (see below), whose sum is σ = 2998431744. Its totient is φ = 2150945280.

The previous prime is 2566478633. The next prime is 2566478683. The reversal of 2566478663 is 3668746652.

It is a cyclic number.

It is not a de Polignac number, because 2566478663 - 2¹⁴ = 2566462279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566478633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 401831 + ... + 408167.

It is an arithmetic number, because the mean of its divisors is an integer number (187401984).

Almost surely, 2^2566478663 is an apocalyptic number.

2566478663 is a deficient number, since it is larger than the sum of its proper divisors (431953081).

2566478663 is a wasteful number, since it uses less digits than its factorization.

2566478663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7622.

The product of its digits is 8709120, while the sum is 53.

The square root of 2566478663 is about 50660.4250179566. The cubic root of 2566478663 is about 1369.1337808391.

The spelling of 2566478663 in words is "two billion, five hundred sixty-six million, four hundred seventy-eight thousand, six hundred sixty-three".