1266622913 has 2 divisors, whose sum is σ = 1266622914. Its totient is φ = 1266622912.

The previous prime is 1266622891. The next prime is 1266622919. The reversal of 1266622913 is 3192266621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 920030224 + 346592689 = 30332^2 + 18617^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266622913 - 2¹⁴ = 1266606529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266622919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633311456 + 633311457.

It is an arithmetic number, because the mean of its divisors is an integer number (633311457).

Almost surely, 2^1266622913 is an apocalyptic number.

It is an amenable number.

1266622913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266622913 is an equidigital number, since it uses as much as digits as its factorization.

1266622913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 1266622913 is about 35589.6461488450. The cubic root of 1266622913 is about 1081.9713972848.

The spelling of 1266622913 in words is "one billion, two hundred sixty-six million, six hundred twenty-two thousand, nine hundred thirteen".