266814571649 has 2 divisors, whose sum is σ = 266814571650. Its totient is φ = 266814571648.

The previous prime is 266814571609. The next prime is 266814571657. The reversal of 266814571649 is 946175418662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256825968400 + 9988603249 = 506780^2 + 99943^2 .

It is a cyclic number.

It is not a de Polignac number, because 266814571649 - 2²⁰ = 266813523073 is a prime.

It is not a weakly prime, because it can be changed into another prime (266814571609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133407285824 + 133407285825.

It is an arithmetic number, because the mean of its divisors is an integer number (133407285825).

Almost surely, 2^266814571649 is an apocalyptic number.

It is an amenable number.

266814571649 is a deficient number, since it is larger than the sum of its proper divisors (1).

266814571649 is an equidigital number, since it uses as much as digits as its factorization.

266814571649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 59.

The spelling of 266814571649 in words is "two hundred sixty-six billion, eight hundred fourteen million, five hundred seventy-one thousand, six hundred forty-nine".