266820823 has 2 divisors, whose sum is σ = 266820824. Its totient is φ = 266820822.

The previous prime is 266820817. The next prime is 266820839. The reversal of 266820823 is 328028662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266820823 - 2⁵ = 266820791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266820803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133410411 + 133410412.

It is an arithmetic number, because the mean of its divisors is an integer number (133410412).

Almost surely, 2^266820823 is an apocalyptic number.

266820823 is a deficient number, since it is larger than the sum of its proper divisors (1).

266820823 is an equidigital number, since it uses as much as digits as its factorization.

266820823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 266820823 is about 16334.6509910680. The cubic root of 266820823 is about 643.7835960975.

The spelling of 266820823 in words is "two hundred sixty-six million, eight hundred twenty thousand, eight hundred twenty-three".