266972791 has 2 divisors, whose sum is σ = 266972792. Its totient is φ = 266972790.

The previous prime is 266972789. The next prime is 266972821. The reversal of 266972791 is 197279662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266972791 - 2¹ = 266972789 is a prime.

It is a super-2 number, since 2×266972791² = 142548942268659362, which contains 22 as substring.

Together with 266972789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266972731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133486395 + 133486396.

It is an arithmetic number, because the mean of its divisors is an integer number (133486396).

Almost surely, 2^266972791 is an apocalyptic number.

266972791 is a deficient number, since it is larger than the sum of its proper divisors (1).

266972791 is an equidigital number, since it uses as much as digits as its factorization.

266972791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 49.

The square root of 266972791 is about 16339.3020352768. The cubic root of 266972791 is about 643.9057953777.

The spelling of 266972791 in words is "two hundred sixty-six million, nine hundred seventy-two thousand, seven hundred ninety-one".