2556020213 has 4 divisors (see below), whose sum is σ = 2566626348. Its totient is φ = 2545414080.

The previous prime is 2556020209. The next prime is 2556020219. The reversal of 2556020213 is 3120206552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 993636484 + 1562383729 = 31522^2 + 39527^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556020213 - 2² = 2556020209 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 (2556020219) 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 3 ways as a sum of consecutive naturals, for example, 5302706 + ... + 5303187.

It is an arithmetic number, because the mean of its divisors is an integer number (641656587).

Almost surely, 2^2556020213 is an apocalyptic number.

It is an amenable number.

2556020213 is a deficient number, since it is larger than the sum of its proper divisors (10606135).

2556020213 is a wasteful number, since it uses less digits than its factorization.

2556020213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606134.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 2556020213 is about 50557.0985421434. The cubic root of 2556020213 is about 1367.2715000884.

Adding to 2556020213 its reverse (3120206552), we get a palindrome (5676226765).

The spelling of 2556020213 in words is "two billion, five hundred fifty-six million, twenty thousand, two hundred thirteen".