1668990699 has 12 divisors (see below), whose sum is σ = 2515580496. Its totient is φ = 1064283792.

The previous prime is 1668990689. The next prime is 1668990721. The reversal of 1668990699 is 9960998661.

It is not a de Polignac number, because 1668990699 - 2⁵ = 1668990667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668990619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4031172 + ... + 4031585.

It is an arithmetic number, because the mean of its divisors is an integer number (209631708).

Almost surely, 2^1668990699 is an apocalyptic number.

1668990699 is a deficient number, since it is larger than the sum of its proper divisors (846589797).

1668990699 is a wasteful number, since it uses less digits than its factorization.

1668990699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8062786 (or 8062783 counting only the distinct ones).

The product of its (nonzero) digits is 11337408, while the sum is 63.

The square root of 1668990699 is about 40853.2825976077. The cubic root of 1668990699 is about 1186.1819345483.

The spelling of 1668990699 in words is "one billion, six hundred sixty-eight million, nine hundred ninety thousand, six hundred ninety-nine".