1266421823 has 2 divisors, whose sum is σ = 1266421824. Its totient is φ = 1266421822.

The previous prime is 1266421813. The next prime is 1266421831. The reversal of 1266421823 is 3281246621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1266421823 - 2¹² = 1266417727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266421813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633210911 + 633210912.

It is an arithmetic number, because the mean of its divisors is an integer number (633210912).

Almost surely, 2^1266421823 is an apocalyptic number.

1266421823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266421823 is an equidigital number, since it uses as much as digits as its factorization.

1266421823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 1266421823 is about 35586.8209173003. The cubic root of 1266421823 is about 1081.9141360586.

The spelling of 1266421823 in words is "one billion, two hundred sixty-six million, four hundred twenty-one thousand, eight hundred twenty-three".