2556736403 has 16 divisors (see below), whose sum is σ = 2917474560. Its totient is φ = 2219636736.

The previous prime is 2556736381. The next prime is 2556736411. The reversal of 2556736403 is 3046376552.

It is a cyclic number.

It is not a de Polignac number, because 2556736403 - 2¹⁸ = 2556474259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2556736103) 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, 385451 + ... + 392027.

It is an arithmetic number, because the mean of its divisors is an integer number (182342160).

Almost surely, 2^2556736403 is an apocalyptic number.

2556736403 is a deficient number, since it is larger than the sum of its proper divisors (360738157).

2556736403 is a wasteful number, since it uses less digits than its factorization.

2556736403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8366.

The product of its (nonzero) digits is 453600, while the sum is 41.

The square root of 2556736403 is about 50564.1810276801. The cubic root of 2556736403 is about 1367.3991900972.

The spelling of 2556736403 in words is "two billion, five hundred fifty-six million, seven hundred thirty-six thousand, four hundred three".