266399999959 has 4 divisors (see below), whose sum is σ = 266401093816. Its totient is φ = 266398906104.

The previous prime is 266399999947. The next prime is 266399999977. The reversal of 266399999959 is 959999993662.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 266399999959 - 2¹⁷ = 266399868887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266399999909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2092 + ... + 729934.

It is an arithmetic number, because the mean of its divisors is an integer number (66600273454).

Almost surely, 2^266399999959 is an apocalyptic number.

266399999959 is a deficient number, since it is larger than the sum of its proper divisors (1093857).

266399999959 is an equidigital number, since it uses as much as digits as its factorization.

266399999959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093856.

The product of its digits is 5165606520, while the sum is 85.

The spelling of 266399999959 in words is "two hundred sixty-six billion, three hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-nine".