1668188611 has 2 divisors, whose sum is σ = 1668188612. Its totient is φ = 1668188610.

The previous prime is 1668188567. The next prime is 1668188651. The reversal of 1668188611 is 1168818661.

It is a strong prime.

It is an emirp because it is prime and its reverse (1168818661) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1198818991 and 1998188911.

It is a cyclic number.

It is not a de Polignac number, because 1668188611 - 2¹⁵ = 1668155843 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668188651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834094305 + 834094306.

It is an arithmetic number, because the mean of its divisors is an integer number (834094306).

Almost surely, 2^1668188611 is an apocalyptic number.

1668188611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668188611 is an equidigital number, since it uses as much as digits as its factorization.

1668188611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 46.

The square root of 1668188611 is about 40843.4647281545. The cubic root of 1668188611 is about 1185.9918846079.

The spelling of 1668188611 in words is "one billion, six hundred sixty-eight million, one hundred eighty-eight thousand, six hundred eleven".