266026991 has 2 divisors, whose sum is σ = 266026992. Its totient is φ = 266026990.

The previous prime is 266026987. The next prime is 266027053. The reversal of 266026991 is 199620662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266026991 - 2² = 266026987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266026951) 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 as a sum of consecutive naturals, namely, 133013495 + 133013496.

It is an arithmetic number, because the mean of its divisors is an integer number (133013496).

Almost surely, 2^266026991 is an apocalyptic number.

266026991 is a deficient number, since it is larger than the sum of its proper divisors (1).

266026991 is an equidigital number, since it uses as much as digits as its factorization.

266026991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 266026991 is about 16310.3338715061. Note that the first 3 decimals coincide. The cubic root of 266026991 is about 643.1445109416.

The spelling of 266026991 in words is "two hundred sixty-six million, twenty-six thousand, nine hundred ninety-one".