1668215167 has 2 divisors, whose sum is σ = 1668215168. Its totient is φ = 1668215166.

The previous prime is 1668215149. The next prime is 1668215173. The reversal of 1668215167 is 7615128661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668215167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668215137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834107583 + 834107584.

It is an arithmetic number, because the mean of its divisors is an integer number (834107584).

Almost surely, 2^1668215167 is an apocalyptic number.

1668215167 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668215167 is an equidigital number, since it uses as much as digits as its factorization.

1668215167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 1668215167 is about 40843.7898217097. The cubic root of 1668215167 is about 1185.9981778677.

The spelling of 1668215167 in words is "one billion, six hundred sixty-eight million, two hundred fifteen thousand, one hundred sixty-seven".