266785997 has 2 divisors, whose sum is σ = 266785998. Its totient is φ = 266785996.

The previous prime is 266785943. The next prime is 266786017. The reversal of 266785997 is 799587662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236821321 + 29964676 = 15389^2 + 5474^2 .

It is a cyclic number.

It is not a de Polignac number, because 266785997 - 2⁶ = 266785933 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 (266785697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133392998 + 133392999.

It is an arithmetic number, because the mean of its divisors is an integer number (133392999).

Almost surely, 2^266785997 is an apocalyptic number.

It is an amenable number.

266785997 is a deficient number, since it is larger than the sum of its proper divisors (1).

266785997 is an equidigital number, since it uses as much as digits as its factorization.

266785997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 59.

The square root of 266785997 is about 16333.5849402389. The cubic root of 266785997 is about 643.7555855612.

The spelling of 266785997 in words is "two hundred sixty-six million, seven hundred eighty-five thousand, nine hundred ninety-seven".