266944650191 has 4 divisors (see below), whose sum is σ = 269696656992. Its totient is φ = 264192643392.

The previous prime is 266944650187. The next prime is 266944650241. The reversal of 266944650191 is 191056449662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 266944650191 - 2² = 266944650187 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 (266944650131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1376003255 + ... + 1376003448.

It is an arithmetic number, because the mean of its divisors is an integer number (67424164248).

Almost surely, 2^266944650191 is an apocalyptic number.

266944650191 is a deficient number, since it is larger than the sum of its proper divisors (2752006801).

266944650191 is an equidigital number, since it uses as much as digits as its factorization.

266944650191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752006800.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 266944650191 in words is "two hundred sixty-six billion, nine hundred forty-four million, six hundred fifty thousand, one hundred ninety-one".