18285986321 has 2 divisors, whose sum is σ = 18285986322. Its totient is φ = 18285986320.

The previous prime is 18285986293. The next prime is 18285986351. The reversal of 18285986321 is 12368958281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18200977921 + 85008400 = 134911^2 + 9220^2 .

It is a cyclic number.

It is not a de Polignac number, because 18285986321 - 2¹⁴ = 18285969937 is a prime.

It is not a weakly prime, because it can be changed into another prime (18285986351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9142993160 + 9142993161.

It is an arithmetic number, because the mean of its divisors is an integer number (9142993161).

Almost surely, 2^18285986321 is an apocalyptic number.

It is an amenable number.

18285986321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18285986321 is an equidigital number, since it uses as much as digits as its factorization.

18285986321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 53.

The spelling of 18285986321 in words is "eighteen billion, two hundred eighty-five million, nine hundred eighty-six thousand, three hundred twenty-one".