2556638455 has 12 divisors (see below), whose sum is σ = 3568858920. Its totient is φ = 1753123344.

The previous prime is 2556638429. The next prime is 2556638471. The reversal of 2556638455 is 5548366552.

It is not a de Polignac number, because 2556638455 - 2²⁵ = 2523084023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 2556638399 and 2556638408.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 5217385 + ... + 5217874.

It is an arithmetic number, because the mean of its divisors is an integer number (297404910).

Almost surely, 2^2556638455 is an apocalyptic number.

2556638455 is a deficient number, since it is larger than the sum of its proper divisors (1012220465).

2556638455 is a wasteful number, since it uses less digits than its factorization.

2556638455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10435278 (or 10435271 counting only the distinct ones).

The product of its digits is 4320000, while the sum is 49.

The square root of 2556638455 is about 50563.2124671683. The cubic root of 2556638455 is about 1367.3817282885.

The spelling of 2556638455 in words is "two billion, five hundred fifty-six million, six hundred thirty-eight thousand, four hundred fifty-five".