266073989 has 2 divisors, whose sum is σ = 266073990. Its totient is φ = 266073988.

The previous prime is 266073979. The next prime is 266074001. The reversal of 266073989 is 989370662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141372100 + 124701889 = 11890^2 + 11167^2 .

It is a cyclic number.

It is not a de Polignac number, because 266073989 - 2¹⁶ = 266008453 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 (266073979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133036994 + 133036995.

It is an arithmetic number, because the mean of its divisors is an integer number (133036995).

Almost surely, 2^266073989 is an apocalyptic number.

It is an amenable number.

266073989 is a deficient number, since it is larger than the sum of its proper divisors (1).

266073989 is an equidigital number, since it uses as much as digits as its factorization.

266073989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 266073989 is about 16311.7745509187. The cubic root of 266073989 is about 643.1823826951.

The spelling of 266073989 in words is "two hundred sixty-six million, seventy-three thousand, nine hundred eighty-nine".