266056406316257 has 2 divisors, whose sum is σ = 266056406316258. Its totient is φ = 266056406316256.

The previous prime is 266056406316223. The next prime is 266056406316277. The reversal of 266056406316257 is 752613604650662.

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., 191256065975296 + 74800340340961 = 13829536^2 + 8648719^2 .

It is a cyclic number.

It is not a de Polignac number, because 266056406316257 - 2³⁶ = 265987686839521 is a prime.

It is a super-2 number, since 2×266056406316257² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 266056406316196 and 266056406316205.

It is not a weakly prime, because it can be changed into another prime (266056406316277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133028203158128 + 133028203158129.

It is an arithmetic number, because the mean of its divisors is an integer number (133028203158129).

Almost surely, 2^{266056406316257} is an apocalyptic number.

It is an amenable number.

266056406316257 is a deficient number, since it is larger than the sum of its proper divisors (1).

266056406316257 is an equidigital number, since it uses as much as digits as its factorization.

266056406316257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65318400, while the sum is 59.

The spelling of 266056406316257 in words is "two hundred sixty-six trillion, fifty-six billion, four hundred six million, three hundred sixteen thousand, two hundred fifty-seven".