266398539649 has 32 divisors (see below), whose sum is σ = 316020879360. Its totient is φ = 221863924800.

The previous prime is 266398539581. The next prime is 266398539677. The reversal of 266398539649 is 946935893662.

It is a happy number.

266398539649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 266398539649 - 2¹³ = 266398531457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266398539679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8880694 + ... + 8910640.

It is an arithmetic number, because the mean of its divisors is an integer number (9875652480).

Almost surely, 2^266398539649 is an apocalyptic number.

It is an amenable number.

266398539649 is a deficient number, since it is larger than the sum of its proper divisors (49622339711).

266398539649 is a wasteful number, since it uses less digits than its factorization.

266398539649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31381.

The product of its digits is 453496320, while the sum is 70.

The spelling of 266398539649 in words is "two hundred sixty-six billion, three hundred ninety-eight million, five hundred thirty-nine thousand, six hundred forty-nine".