1336666691 has 2 divisors, whose sum is σ = 1336666692. Its totient is φ = 1336666690.

The previous prime is 1336666679. The next prime is 1336666763. The reversal of 1336666691 is 1966666331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1336666691 - 2⁶ = 1336666627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1336666601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 668333345 + 668333346.

It is an arithmetic number, because the mean of its divisors is an integer number (668333346).

Almost surely, 2^1336666691 is an apocalyptic number.

1336666691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1336666691 is an equidigital number, since it uses as much as digits as its factorization.

1336666691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 47.

The square root of 1336666691 is about 36560.4525546389. The cubic root of 1336666691 is about 1101.5588617210.

The spelling of 1336666691 in words is "one billion, three hundred thirty-six million, six hundred sixty-six thousand, six hundred ninety-one".