1669987500 has 72 divisors (see below), whose sum is σ = 4870594512. Its totient is φ = 445320000.

The previous prime is 1669987499. The next prime is 1669987549. The reversal of 1669987500 is 57899661.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 15234 + ... + 59766.

It is an arithmetic number, because the mean of its divisors is an integer number (67647146).

Almost surely, 2^1669987500 is an apocalyptic number.

1669987500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1669987500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2435297256).

1669987500 is an abundant number, since it is smaller than the sum of its proper divisors (3200607012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1669987500 is an equidigital number, since it uses as much as digits as its factorization.

1669987500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44565 (or 44543 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 51.

The square root of 1669987500 is about 40865.4805428738. The cubic root of 1669987500 is about 1186.4180357290.

The spelling of 1669987500 in words is "one billion, six hundred sixty-nine million, nine hundred eighty-seven thousand, five hundred".