256566763 has 2 divisors, whose sum is σ = 256566764. Its totient is φ = 256566762.

The previous prime is 256566733. The next prime is 256566773. The reversal of 256566763 is 367665652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256566763 - 2¹⁷ = 256435691 is a prime.

It is not a weakly prime, because it can be changed into another prime (256566733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128283381 + 128283382.

It is an arithmetic number, because the mean of its divisors is an integer number (128283382).

Almost surely, 2^256566763 is an apocalyptic number.

256566763 is a deficient number, since it is larger than the sum of its proper divisors (1).

256566763 is an equidigital number, since it uses as much as digits as its factorization.

256566763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 46.

The square root of 256566763 is about 16017.7015517208. The cubic root of 256566763 is about 635.4286588386.

The spelling of 256566763 in words is "two hundred fifty-six million, five hundred sixty-six thousand, seven hundred sixty-three".