2556121433 has 16 divisors (see below), whose sum is σ = 2729063040. Its totient is φ = 2387232000.

The previous prime is 2556121429. The next prime is 2556121453. The reversal of 2556121433 is 3341216552.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2556121433 - 2² = 2556121429 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 2556121433.

It is not an unprimeable number, because it can be changed into a prime (2556121453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 459716 + ... + 465242.

It is an arithmetic number, because the mean of its divisors is an integer number (170566440).

Almost surely, 2^2556121433 is an apocalyptic number.

It is an amenable number.

2556121433 is a deficient number, since it is larger than the sum of its proper divisors (172941607).

2556121433 is a wasteful number, since it uses less digits than its factorization.

2556121433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5888.

The product of its digits is 21600, while the sum is 32.

The square root of 2556121433 is about 50558.0995786036. The cubic root of 2556121433 is about 1367.2895481191.

Adding to 2556121433 its reverse (3341216552), we get a palindrome (5897337985).

The spelling of 2556121433 in words is "two billion, five hundred fifty-six million, one hundred twenty-one thousand, four hundred thirty-three".