266620601873 has 2 divisors, whose sum is σ = 266620601874. Its totient is φ = 266620601872.

The previous prime is 266620601867. The next prime is 266620601939. The reversal of 266620601873 is 378106026662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255058331089 + 11562270784 = 505033^2 + 107528^2 .

It is a cyclic number.

It is not a de Polignac number, because 266620601873 - 2⁴ = 266620601857 is a prime.

It is a super-2 number, since 2×266620601873² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (266620601843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133310300936 + 133310300937.

It is an arithmetic number, because the mean of its divisors is an integer number (133310300937).

Almost surely, 2^266620601873 is an apocalyptic number.

It is an amenable number.

266620601873 is a deficient number, since it is larger than the sum of its proper divisors (1).

266620601873 is an equidigital number, since it uses as much as digits as its factorization.

266620601873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 266620601873 in words is "two hundred sixty-six billion, six hundred twenty million, six hundred one thousand, eight hundred seventy-three".