1661808288 has 48 divisors (see below), whose sum is σ = 4985426880. Its totient is φ = 474802176.

The previous prime is 1661808233. The next prime is 1661808301. The reversal of 1661808288 is 8828081661.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1235793 + ... + 1237136.

It is an arithmetic number, because the mean of its divisors is an integer number (103863060).

Almost surely, 2^1661808288 is an apocalyptic number.

It is an amenable number.

1661808288 is an abundant number, since it is smaller than the sum of its proper divisors (3323618592).

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

1661808288 is a wasteful number, since it uses less digits than its factorization.

1661808288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472949 (or 2472941 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 48.

The square root of 1661808288 is about 40765.2828764869. The cubic root of 1661808288 is about 1184.4779312923.

The spelling of 1661808288 in words is "one billion, six hundred sixty-one million, eight hundred eight thousand, two hundred eighty-eight".