18065677890 has 128 divisors (see below), whose sum is σ = 49482316800. Its totient is φ = 4188764160.

The previous prime is 18065677871. The next prime is 18065677921. The reversal of 18065677890 is 9877656081.

It is a self number, because there is not a number n which added to its sum of digits gives 18065677890.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 444231 + ... + 483189.

It is an arithmetic number, because the mean of its divisors is an integer number (386580600).

Almost surely, 2^18065677890 is an apocalyptic number.

18065677890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18065677890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24741158400).

18065677890 is an abundant number, since it is smaller than the sum of its proper divisors (31416638910).

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

18065677890 is a wasteful number, since it uses less digits than its factorization.

18065677890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39052.

The product of its (nonzero) digits is 5080320, while the sum is 57.

The spelling of 18065677890 in words is "eighteen billion, sixty-five million, six hundred seventy-seven thousand, eight hundred ninety".