2556401223 has 4 divisors (see below), whose sum is σ = 3408534968. Its totient is φ = 1704267480.

The previous prime is 2556401179. The next prime is 2556401249. The reversal of 2556401223 is 3221046552.

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

It is not a de Polignac number, because 2556401223 - 2¹³ = 2556393031 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 (2556401273) 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, 426066868 + ... + 426066873.

It is an arithmetic number, because the mean of its divisors is an integer number (852133742).

Almost surely, 2^2556401223 is an apocalyptic number.

2556401223 is a deficient number, since it is larger than the sum of its proper divisors (852133745).

2556401223 is an equidigital number, since it uses as much as digits as its factorization.

2556401223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852133744.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 2556401223 is about 50560.8665174955. The cubic root of 2556401223 is about 1367.3394335928.

Adding to 2556401223 its reverse (3221046552), we get a palindrome (5777447775).

The spelling of 2556401223 in words is "two billion, five hundred fifty-six million, four hundred one thousand, two hundred twenty-three".