1668216099 has 16 divisors (see below), whose sum is σ = 2431344384. Its totient is φ = 1009020000.

The previous prime is 1668216083. The next prime is 1668216107. The reversal of 1668216099 is 9906128661.

It is not a de Polignac number, because 1668216099 - 2⁴ = 1668216083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668216019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33652 + ... + 66849.

It is an arithmetic number, because the mean of its divisors is an integer number (151959024).

Almost surely, 2^1668216099 is an apocalyptic number.

1668216099 is a deficient number, since it is larger than the sum of its proper divisors (763128285).

1668216099 is a wasteful number, since it uses less digits than its factorization.

1668216099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101018.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 1668216099 is about 40843.8012310314. The cubic root of 1668216099 is about 1185.9983987326.

The spelling of 1668216099 in words is "one billion, six hundred sixty-eight million, two hundred sixteen thousand, ninety-nine".