2556503603405 has 16 divisors (see below), whose sum is σ = 3071412345600. Its totient is φ = 2042797933440.

The previous prime is 2556503603393. The next prime is 2556503603441. The reversal of 2556503603405 is 5043063056552.

It is not a de Polignac number, because 2556503603405 - 2⁶ = 2556503603341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82882976 + ... + 82913814.

It is an arithmetic number, because the mean of its divisors is an integer number (191963271600).

Almost surely, 2^{2556503603405} is an apocalyptic number.

It is an amenable number.

2556503603405 is a deficient number, since it is larger than the sum of its proper divisors (514908742195).

2556503603405 is a wasteful number, since it uses less digits than its factorization.

2556503603405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49804.

The product of its (nonzero) digits is 1620000, while the sum is 44.

Adding to 2556503603405 its reverse (5043063056552), we get a palindrome (7599566659957).

The spelling of 2556503603405 in words is "two trillion, five hundred fifty-six billion, five hundred three million, six hundred three thousand, four hundred five".