2566401563 has 16 divisors (see below), whose sum is σ = 2855347200. Its totient is φ = 2286816480.

The previous prime is 2566401559. The next prime is 2566401569. The reversal of 2566401563 is 3651046652.

It is a happy number.

2566401563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2566401563 - 2² = 2566401559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2566401569) 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, 942518 + ... + 945236.

It is an arithmetic number, because the mean of its divisors is an integer number (178459200).

Almost surely, 2^2566401563 is an apocalyptic number.

2566401563 is a deficient number, since it is larger than the sum of its proper divisors (288945637).

2566401563 is a wasteful number, since it uses less digits than its factorization.

2566401563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4402.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 2566401563 is about 50659.6640632367. The cubic root of 2566401563 is about 1369.1200705788.

The spelling of 2566401563 in words is "two billion, five hundred sixty-six million, four hundred one thousand, five hundred sixty-three".