266676988891 has 2 divisors, whose sum is σ = 266676988892. Its totient is φ = 266676988890.

The previous prime is 266676988871. The next prime is 266676988913. The reversal of 266676988891 is 198889676662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266676988891 - 2¹⁷ = 266676857819 is a prime.

It is a super-2 number, since 2×266676988891² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (266676988871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133338494445 + 133338494446.

It is an arithmetic number, because the mean of its divisors is an integer number (133338494446).

Almost surely, 2^266676988891 is an apocalyptic number.

266676988891 is a deficient number, since it is larger than the sum of its proper divisors (1).

266676988891 is an equidigital number, since it uses as much as digits as its factorization.

266676988891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752467968, while the sum is 76.

The spelling of 266676988891 in words is "two hundred sixty-six billion, six hundred seventy-six million, nine hundred eighty-eight thousand, eight hundred ninety-one".