18066898 has 4 divisors (see below), whose sum is σ = 27100350. Its totient is φ = 9033448.

The previous prime is 18066889. The next prime is 18066899. The reversal of 18066898 is 89866081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15944049 + 2122849 = 3993^2 + 1457^2 .

It is not an unprimeable number, because it can be changed into a prime (18066899) by changing a digit.

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 as a sum of consecutive naturals, namely, 4516723 + ... + 4516726.

Almost surely, 2^18066898 is an apocalyptic number.

18066898 is a deficient number, since it is larger than the sum of its proper divisors (9033452).

18066898 is an equidigital number, since it uses as much as digits as its factorization.

18066898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9033451.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 18066898 is about 4250.5173802727. The cubic root of 18066898 is about 262.3984090630.

The spelling of 18066898 in words is "eighteen million, sixty-six thousand, eight hundred ninety-eight".