266228813819 has 2 divisors, whose sum is σ = 266228813820. Its totient is φ = 266228813818.

The previous prime is 266228813707. The next prime is 266228813821. The reversal of 266228813819 is 918318822662.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266228813819 - 2¹⁶ = 266228748283 is a prime.

It is a super-2 number, since 2×266228813819² (a number of 24 digits) contains 22 as substring.

Together with 266228813821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (266228813899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133114406909 + 133114406910.

It is an arithmetic number, because the mean of its divisors is an integer number (133114406910).

Almost surely, 2^266228813819 is an apocalyptic number.

266228813819 is a deficient number, since it is larger than the sum of its proper divisors (1).

266228813819 is an equidigital number, since it uses as much as digits as its factorization.

266228813819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3981312, while the sum is 56.

The spelling of 266228813819 in words is "two hundred sixty-six billion, two hundred twenty-eight million, eight hundred thirteen thousand, eight hundred nineteen".