265663976891 has 2 divisors, whose sum is σ = 265663976892. Its totient is φ = 265663976890.

The previous prime is 265663976867. The next prime is 265663976911. The reversal of 265663976891 is 198679366562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265663976891 - 2²⁶ = 265596868027 is a prime.

It is not a weakly prime, because it can be changed into another prime (265663976491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132831988445 + 132831988446.

It is an arithmetic number, because the mean of its divisors is an integer number (132831988446).

Almost surely, 2^265663976891 is an apocalyptic number.

265663976891 is a deficient number, since it is larger than the sum of its proper divisors (1).

265663976891 is an equidigital number, since it uses as much as digits as its factorization.

265663976891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176359680, while the sum is 68.

The spelling of 265663976891 in words is "two hundred sixty-five billion, six hundred sixty-three million, nine hundred seventy-six thousand, eight hundred ninety-one".