1669872899 has 4 divisors (see below), whose sum is σ = 1670389800. Its totient is φ = 1669356000.

The previous prime is 1669872871. The next prime is 1669872901. The reversal of 1669872899 is 9982789661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1669872899 - 2¹² = 1669868803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669872829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253574 + ... + 260075.

It is an arithmetic number, because the mean of its divisors is an integer number (417597450).

Almost surely, 2^1669872899 is an apocalyptic number.

1669872899 is a deficient number, since it is larger than the sum of its proper divisors (516901).

1669872899 is an equidigital number, since it uses as much as digits as its factorization.

1669872899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516900.

The product of its digits is 23514624, while the sum is 65.

The square root of 1669872899 is about 40864.0783451677. The cubic root of 1669872899 is about 1186.3908962437.

The spelling of 1669872899 in words is "one billion, six hundred sixty-nine million, eight hundred seventy-two thousand, eight hundred ninety-nine".