6256256891 has 2 divisors, whose sum is σ = 6256256892. Its totient is φ = 6256256890.

The previous prime is 6256256861. The next prime is 6256256957. The reversal of 6256256891 is 1986526526.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6256256891 - 2³⁰ = 5182515067 is a prime.

It is not a weakly prime, because it can be changed into another prime (6256256801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3128128445 + 3128128446.

It is an arithmetic number, because the mean of its divisors is an integer number (3128128446).

Almost surely, 2^6256256891 is an apocalyptic number.

6256256891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6256256891 is an equidigital number, since it uses as much as digits as its factorization.

6256256891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 50.

The square root of 6256256891 is about 79096.5036585057. The cubic root of 6256256891 is about 1842.6302265416.

The spelling of 6256256891 in words is "six billion, two hundred fifty-six million, two hundred fifty-six thousand, eight hundred ninety-one".