2566553863 has 8 divisors (see below), whose sum is σ = 2623320000. Its totient is φ = 2509877760.

The previous prime is 2566553861. The next prime is 2566553881. The reversal of 2566553863 is 3683556652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2566553863 - 2¹ = 2566553861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566553861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36843 + ... + 80563.

It is an arithmetic number, because the mean of its divisors is an integer number (327915000).

Almost surely, 2^2566553863 is an apocalyptic number.

2566553863 is a deficient number, since it is larger than the sum of its proper divisors (56766137).

2566553863 is a wasteful number, since it uses less digits than its factorization.

2566553863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45017.

The product of its digits is 3888000, while the sum is 49.

The square root of 2566553863 is about 50661.1672092146. The cubic root of 2566553863 is about 1369.1471529685.

The spelling of 2566553863 in words is "two billion, five hundred sixty-six million, five hundred fifty-three thousand, eight hundred sixty-three".