18161633 has 8 divisors (see below), whose sum is σ = 20818752. Its totient is φ = 15520176.

The previous prime is 18161621. The next prime is 18161641. The reversal of 18161633 is 33616181.

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

It is not a de Polignac number, because 18161633 - 2¹⁴ = 18145249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18161596 and 18161605.

It is not an unprimeable number, because it can be changed into a prime (18161683) 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 in 7 ways as a sum of consecutive naturals, for example, 1310 + ... + 6167.

It is an arithmetic number, because the mean of its divisors is an integer number (2602344).

Almost surely, 2^18161633 is an apocalyptic number.

It is an amenable number.

18161633 is a deficient number, since it is larger than the sum of its proper divisors (2657119).

18161633 is an equidigital number, since it uses as much as digits as its factorization.

18161633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7831.

The product of its digits is 2592, while the sum is 29.

The square root of 18161633 is about 4261.6467474440. The cubic root of 18161633 is about 262.8562443568.

The spelling of 18161633 in words is "eighteen million, one hundred sixty-one thousand, six hundred thirty-three".