669990111611 has 2 divisors, whose sum is σ = 669990111612. Its totient is φ = 669990111610.

The previous prime is 669990111559. The next prime is 669990111647. The reversal of 669990111611 is 116111099966.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669990111611 - 2¹⁸ = 669989849467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669990111611.

It is not a weakly prime, because it can be changed into another prime (669990111811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334995055805 + 334995055806.

It is an arithmetic number, because the mean of its divisors is an integer number (334995055806).

Almost surely, 2^669990111611 is an apocalyptic number.

669990111611 is a deficient number, since it is larger than the sum of its proper divisors (1).

669990111611 is an equidigital number, since it uses as much as digits as its factorization.

669990111611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 50.

The spelling of 669990111611 in words is "six hundred sixty-nine billion, nine hundred ninety million, one hundred eleven thousand, six hundred eleven".