265921867 has 2 divisors, whose sum is σ = 265921868. Its totient is φ = 265921866.

The previous prime is 265921841. The next prime is 265921907. The reversal of 265921867 is 768129562.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265921867 is a prime.

It is not a weakly prime, because it can be changed into another prime (265921067) 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, 132960933 + 132960934.

It is an arithmetic number, because the mean of its divisors is an integer number (132960934).

Almost surely, 2^265921867 is an apocalyptic number.

265921867 is a deficient number, since it is larger than the sum of its proper divisors (1).

265921867 is an equidigital number, since it uses as much as digits as its factorization.

265921867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 46.

The square root of 265921867 is about 16307.1109335774. The cubic root of 265921867 is about 643.0597841614.

The spelling of 265921867 in words is "two hundred sixty-five million, nine hundred twenty-one thousand, eight hundred sixty-seven".