1266216499 has 2 divisors, whose sum is σ = 1266216500. Its totient is φ = 1266216498.

The previous prime is 1266216433. The next prime is 1266216521. The reversal of 1266216499 is 9946126621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1266216499 - 2²¹ = 1264119347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266216199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633108249 + 633108250.

It is an arithmetic number, because the mean of its divisors is an integer number (633108250).

Almost surely, 2^1266216499 is an apocalyptic number.

1266216499 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266216499 is an equidigital number, since it uses as much as digits as its factorization.

1266216499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 1266216499 is about 35583.9359683552. The cubic root of 1266216499 is about 1081.8556629284.

It can be divided in two parts, 12662 and 16499, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 1266216499 in words is "one billion, two hundred sixty-six million, two hundred sixteen thousand, four hundred ninety-nine".