266590836436991 has 16 divisors (see below), whose sum is σ = 292938128346240. Its totient is φ = 240601604587680.

The previous prime is 266590836436823. The next prime is 266590836436999. The reversal of 266590836436991 is 199634638095662.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266590836436991 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 (266590836436999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151621601 + ... + 153369786.

It is an arithmetic number, because the mean of its divisors is an integer number (18308633021640).

Almost surely, 2^{266590836436991} is an apocalyptic number.

266590836436991 is a deficient number, since it is larger than the sum of its proper divisors (26347291909249).

266590836436991 is a wasteful number, since it uses less digits than its factorization.

266590836436991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304991974.

The product of its (nonzero) digits is 2720977920, while the sum is 77.

The spelling of 266590836436991 in words is "two hundred sixty-six trillion, five hundred ninety billion, eight hundred thirty-six million, four hundred thirty-six thousand, nine hundred ninety-one".