2556216229 has 4 divisors (see below), whose sum is σ = 2921389984. Its totient is φ = 2191042476.

The previous prime is 2556216209. The next prime is 2556216263. The reversal of 2556216229 is 9226126552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-2556216229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2556216191 and 2556216200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556216209) 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, 182586867 + ... + 182586880.

It is an arithmetic number, because the mean of its divisors is an integer number (730347496).

Almost surely, 2^2556216229 is an apocalyptic number.

It is an amenable number.

2556216229 is a deficient number, since it is larger than the sum of its proper divisors (365173755).

2556216229 is an equidigital number, since it uses as much as digits as its factorization.

2556216229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365173754.

The product of its digits is 129600, while the sum is 40.

The square root of 2556216229 is about 50559.0370655929. The cubic root of 2556216229 is about 1367.3064502866.

The spelling of 2556216229 in words is "two billion, five hundred fifty-six million, two hundred sixteen thousand, two hundred twenty-nine".