1669994999 has 8 divisors (see below), whose sum is σ = 1718386560. Its totient is φ = 1622037816.

The previous prime is 1669994959. The next prime is 1669995001. The reversal of 1669994999 is 9994999661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669994999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669994959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100787 + ... + 116180.

It is an arithmetic number, because the mean of its divisors is an integer number (214798320).

Almost surely, 2^1669994999 is an apocalyptic number.

1669994999 is a deficient number, since it is larger than the sum of its proper divisors (48391561).

1669994999 is a wasteful number, since it uses less digits than its factorization.

1669994999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217189.

The product of its digits is 76527504, while the sum is 71.

The square root of 1669994999 is about 40865.5722950260. The cubic root of 1669994999 is about 1186.4198115777.

The spelling of 1669994999 in words is "one billion, six hundred sixty-nine million, nine hundred ninety-four thousand, nine hundred ninety-nine".