1801660889 has 8 divisors (see below), whose sum is σ = 2060558208. Its totient is φ = 1543142880.

The previous prime is 1801660849. The next prime is 1801660961. The reversal of 1801660889 is 9880661081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1801660889 - 2¹² = 1801656793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1801660849) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 84572 + ... + 103709.

It is an arithmetic number, because the mean of its divisors is an integer number (257569776).

Almost surely, 2^1801660889 is an apocalyptic number.

It is an amenable number.

1801660889 is a deficient number, since it is larger than the sum of its proper divisors (258897319).

1801660889 is a wasteful number, since it uses less digits than its factorization.

1801660889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189655.

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 1801660889 is about 42445.9761225961. The cubic root of 1801660889 is about 1216.8144271492.

The spelling of 1801660889 in words is "one billion, eight hundred one million, six hundred sixty thousand, eight hundred eighty-nine".