1668513211 has 2 divisors, whose sum is σ = 1668513212. Its totient is φ = 1668513210.

The previous prime is 1668513137. The next prime is 1668513239. The reversal of 1668513211 is 1123158661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1668513211 - 2⁷ = 1668513083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668511211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834256605 + 834256606.

It is an arithmetic number, because the mean of its divisors is an integer number (834256606).

Almost surely, 2^1668513211 is an apocalyptic number.

1668513211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668513211 is an equidigital number, since it uses as much as digits as its factorization.

1668513211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The square root of 1668513211 is about 40847.4382428078. The cubic root of 1668513211 is about 1186.0688039674.

The spelling of 1668513211 in words is "one billion, six hundred sixty-eight million, five hundred thirteen thousand, two hundred eleven".