266183993 has 2 divisors, whose sum is σ = 266183994. Its totient is φ = 266183992.

The previous prime is 266183971. The next prime is 266184001. The reversal of 266183993 is 399381662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138109504 + 128074489 = 11752^2 + 11317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266183993 is a prime.

It is not a weakly prime, because it can be changed into another prime (266183933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133091996 + 133091997.

It is an arithmetic number, because the mean of its divisors is an integer number (133091997).

Almost surely, 2^266183993 is an apocalyptic number.

It is an amenable number.

266183993 is a deficient number, since it is larger than the sum of its proper divisors (1).

266183993 is an equidigital number, since it uses as much as digits as its factorization.

266183993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 47.

The square root of 266183993 is about 16315.1461225451. The cubic root of 266183993 is about 643.2710082773.

The spelling of 266183993 in words is "two hundred sixty-six million, one hundred eighty-three thousand, nine hundred ninety-three".