1266220799 has 2 divisors, whose sum is σ = 1266220800. Its totient is φ = 1266220798.

The previous prime is 1266220777. The next prime is 1266220801. The reversal of 1266220799 is 9970226621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1266220799 - 2¹⁶ = 1266155263 is a prime.

It is a super-2 number, since 2×1266220799² = 3206630223640396802, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1266220801, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266220199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633110399 + 633110400.

It is an arithmetic number, because the mean of its divisors is an integer number (633110400).

Almost surely, 2^1266220799 is an apocalyptic number.

1266220799 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266220799 is an equidigital number, since it uses as much as digits as its factorization.

1266220799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 1266220799 is about 35583.9963888263. The cubic root of 1266220799 is about 1081.8568875673.

The spelling of 1266220799 in words is "one billion, two hundred sixty-six million, two hundred twenty thousand, seven hundred ninety-nine".