2556739305 has 12 divisors (see below), whose sum is σ = 4431681540. Its totient is φ = 1363594272.

The previous prime is 2556739261. The next prime is 2556739307. The reversal of 2556739305 is 5039376552.

It is a happy number.

2556739305 is a `hidden beast` number, since 2 + 556 + 7 + 3 + 93 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1912137984 + 644601321 = 43728^2 + 25389^2 .

It is not a de Polignac number, because 2556739305 - 2¹¹ = 2556737257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 56816429 = 2556739305 / (2 + 5 + 5 + 6 + 7 + 3 + 9 + 3 + 0 + 5).

It is not an unprimeable number, because it can be changed into a prime (2556739307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28408170 + ... + 28408259.

It is an arithmetic number, because the mean of its divisors is an integer number (369306795).

Almost surely, 2^2556739305 is an apocalyptic number.

It is an amenable number.

2556739305 is a deficient number, since it is larger than the sum of its proper divisors (1874942235).

2556739305 is a wasteful number, since it uses less digits than its factorization.

2556739305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56816440 (or 56816437 counting only the distinct ones).

The product of its (nonzero) digits is 850500, while the sum is 45.

The square root of 2556739305 is about 50564.2097238749. The cubic root of 2556739305 is about 1367.3997074483.

The spelling of 2556739305 in words is "two billion, five hundred fifty-six million, seven hundred thirty-nine thousand, three hundred five".