1661816104 has 16 divisors (see below), whose sum is σ = 3355590420. Its totient is φ = 766992000.

The previous prime is 1661816041. The next prime is 1661816129. The reversal of 1661816104 is 4016181661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1658932900 + 2883204 = 40730^2 + 1698^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1661816104.

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 3 ways as a sum of consecutive naturals, for example, 7989397 + ... + 7989604.

Almost surely, 2^1661816104 is an apocalyptic number.

It is an amenable number.

1661816104 is an abundant number, since it is smaller than the sum of its proper divisors (1693774316).

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

1661816104 is a wasteful number, since it uses less digits than its factorization.

1661816104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15979020 (or 15979016 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1661816104 is about 40765.3787422612. The cubic root of 1661816104 is about 1184.4797882784.

Adding to 1661816104 its reverse (4016181661), we get a palindrome (5677997765).

The spelling of 1661816104 in words is "one billion, six hundred sixty-one million, eight hundred sixteen thousand, one hundred four".