1266899999 has 2 divisors, whose sum is σ = 1266900000. Its totient is φ = 1266899998.

The previous prime is 1266899957. The next prime is 1266900049. The reversal of 1266899999 is 9999986621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1266899999 - 2²⁸ = 998464543 is a prime.

1266899999 is a modest number, since divided by 99999 gives 12668 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266899929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633449999 + 633450000.

It is an arithmetic number, because the mean of its divisors is an integer number (633450000).

Almost surely, 2^1266899999 is an apocalyptic number.

1266899999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266899999 is an equidigital number, since it uses as much as digits as its factorization.

1266899999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34012224, while the sum is 68.

The square root of 1266899999 is about 35593.5387254485. The cubic root of 1266899999 is about 1082.0502887646.

The spelling of 1266899999 in words is "one billion, two hundred sixty-six million, eight hundred ninety-nine thousand, nine hundred ninety-nine".