2564231666 has 16 divisors (see below), whose sum is σ = 3888349920. Its totient is φ = 1268131200.

The previous prime is 2564231651. The next prime is 2564231671. The reversal of 2564231666 is 6661324652.

It is a happy number.

2564231666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 450941 + ... + 456591.

It is an arithmetic number, because the mean of its divisors is an integer number (243021870).

Almost surely, 2^2564231666 is an apocalyptic number.

2564231666 is a deficient number, since it is larger than the sum of its proper divisors (1324118254).

2564231666 is a wasteful number, since it uses less digits than its factorization.

2564231666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8089.

The product of its digits is 311040, while the sum is 41.

The square root of 2564231666 is about 50638.2431172330. The cubic root of 2564231666 is about 1368.7340973083.

The spelling of 2564231666 in words is "two billion, five hundred sixty-four million, two hundred thirty-one thousand, six hundred sixty-six".