1661883008 has 64 divisors (see below), whose sum is σ = 3558168000. Its totient is φ = 770322432.

The previous prime is 1661883001. The next prime is 1661883017. The reversal of 1661883008 is 8003881661.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1661883001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140093 + ... + 151491.

It is an arithmetic number, because the mean of its divisors is an integer number (55596375).

Almost surely, 2^1661883008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661883008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1779084000).

1661883008 is an abundant number, since it is smaller than the sum of its proper divisors (1896284992).

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

1661883008 is a wasteful number, since it uses less digits than its factorization.

1661883008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11497 (or 11485 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 1661883008 is about 40766.1993322900. The cubic root of 1661883008 is about 1184.4956836137.

The spelling of 1661883008 in words is "one billion, six hundred sixty-one million, eight hundred eighty-three thousand, eight".