2556804658 has 16 divisors (see below), whose sum is σ = 4071057624. Its totient is φ = 1200165120.

The previous prime is 2556804647. The next prime is 2556804659. The reversal of 2556804658 is 8564086552.

2556804658 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2453518089 + 103286569 = 49533^2 + 10163^2 .

It is not an unprimeable number, because it can be changed into a prime (2556804659) 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, 81213 + ... + 108208.

Almost surely, 2^2556804658 is an apocalyptic number.

2556804658 is a deficient number, since it is larger than the sum of its proper divisors (1514252966).

2556804658 is a wasteful number, since it uses less digits than its factorization.

2556804658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189837.

The product of its (nonzero) digits is 2304000, while the sum is 49.

The square root of 2556804658 is about 50564.8559574731. The cubic root of 2556804658 is about 1367.4113580836.

The spelling of 2556804658 in words is "two billion, five hundred fifty-six million, eight hundred four thousand, six hundred fifty-eight".