1669690666 has 16 divisors (see below), whose sum is σ = 3030699456. Its totient is φ = 673488576.

The previous prime is 1669690637. The next prime is 1669690669. The reversal of 1669690666 is 6660969661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1669690669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3507516 + ... + 3507991.

It is an arithmetic number, because the mean of its divisors is an integer number (189418716).

Almost surely, 2^1669690666 is an apocalyptic number.

1669690666 is a deficient number, since it is larger than the sum of its proper divisors (1361008790).

1669690666 is a wasteful number, since it uses less digits than its factorization.

1669690666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7015533.

The product of its (nonzero) digits is 3779136, while the sum is 55.

The square root of 1669690666 is about 40861.8485387042. The cubic root of 1669690666 is about 1186.3477377819.

The spelling of 1669690666 in words is "one billion, six hundred sixty-nine million, six hundred ninety thousand, six hundred sixty-six".