2556403111 has 4 divisors (see below), whose sum is σ = 2557460592. Its totient is φ = 2555345632.

The previous prime is 2556403097. The next prime is 2556403139. The reversal of 2556403111 is 1113046552.

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

It is a cyclic number.

It is not a de Polignac number, because 2556403111 - 2¹¹ = 2556401063 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 2556403111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556403141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525106 + ... + 529951.

It is an arithmetic number, because the mean of its divisors is an integer number (639365148).

Almost surely, 2^2556403111 is an apocalyptic number.

2556403111 is a deficient number, since it is larger than the sum of its proper divisors (1057481).

2556403111 is a wasteful number, since it uses less digits than its factorization.

2556403111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057480.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 2556403111 is about 50560.8851880582. The cubic root of 2556403111 is about 1367.3397702036.

Adding to 2556403111 its reverse (1113046552), we get a palindrome (3669449663).

The spelling of 2556403111 in words is "two billion, five hundred fifty-six million, four hundred three thousand, one hundred eleven".