266256587 has 2 divisors, whose sum is σ = 266256588. Its totient is φ = 266256586.

The previous prime is 266256581. The next prime is 266256607. The reversal of 266256587 is 785652662.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266256587 is a prime.

It is not a weakly prime, because it can be changed into another prime (266256581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133128293 + 133128294.

It is an arithmetic number, because the mean of its divisors is an integer number (133128294).

Almost surely, 2^266256587 is an apocalyptic number.

266256587 is a deficient number, since it is larger than the sum of its proper divisors (1).

266256587 is an equidigital number, since it uses as much as digits as its factorization.

266256587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 47.

The square root of 266256587 is about 16317.3707134452. The cubic root of 266256587 is about 643.3294808280.

The spelling of 266256587 in words is "two hundred sixty-six million, two hundred fifty-six thousand, five hundred eighty-seven".