2556516013 has 4 divisors (see below), whose sum is σ = 2566020060. Its totient is φ = 2547011968.

The previous prime is 2556516007. The next prime is 2556516041. The reversal of 2556516013 is 3106156552.

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 168532324 + 2387983689 = 12982^2 + 48867^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556516013 - 2⁹ = 2556515501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2556516013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556516113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4751620 + ... + 4752157.

It is an arithmetic number, because the mean of its divisors is an integer number (641505015).

Almost surely, 2^2556516013 is an apocalyptic number.

It is an amenable number.

2556516013 is a deficient number, since it is larger than the sum of its proper divisors (9504047).

2556516013 is an equidigital number, since it uses as much as digits as its factorization.

2556516013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9504046.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 2556516013 is about 50562.0016712155. The cubic root of 2556516013 is about 1367.3598991524.

The spelling of 2556516013 in words is "two billion, five hundred fifty-six million, five hundred sixteen thousand, thirteen".