2556623620243 has 8 divisors (see below), whose sum is σ = 3187478799360. Its totient is φ = 1992174249480.

The previous prime is 2556623620231. The next prime is 2556623620301. The reversal of 2556623620243 is 3420263266552.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2556623620243 - 2²⁹ = 2556086749331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2556623620193 and 2556623620202.

It is not an unprimeable number, because it can be changed into a prime (2556623620643) 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, 16601452003 + ... + 16601452156.

It is an arithmetic number, because the mean of its divisors is an integer number (398434849920).

Almost surely, 2^{2556623620243} is an apocalyptic number.

2556623620243 is a deficient number, since it is larger than the sum of its proper divisors (630855179117).

2556623620243 is a wasteful number, since it uses less digits than its factorization.

2556623620243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33202904177.

The product of its (nonzero) digits is 3110400, while the sum is 46.

Adding to 2556623620243 its reverse (3420263266552), we get a palindrome (5976886886795).

The spelling of 2556623620243 in words is "two trillion, five hundred fifty-six billion, six hundred twenty-three million, six hundred twenty thousand, two hundred forty-three".