2556891593 has 8 divisors (see below), whose sum is σ = 2563420608. Its totient is φ = 2550371824.

The previous prime is 2556891583. The next prime is 2556891611. The reversal of 2556891593 is 3951986552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2556891593 - 2⁶ = 2556891529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556891583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1275530 + ... + 1277532.

It is an arithmetic number, because the mean of its divisors is an integer number (320427576).

Almost surely, 2^2556891593 is an apocalyptic number.

It is an amenable number.

2556891593 is a deficient number, since it is larger than the sum of its proper divisors (6529015).

2556891593 is a wasteful number, since it uses less digits than its factorization.

2556891593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4623.

The product of its digits is 2916000, while the sum is 53.

The square root of 2556891593 is about 50565.7155887267. The cubic root of 2556891593 is about 1367.4268558859.

The spelling of 2556891593 in words is "two billion, five hundred fifty-six million, eight hundred ninety-one thousand, five hundred ninety-three".