18149663 has 8 divisors (see below), whose sum is σ = 21411840. Its totient is φ = 15054840.

The previous prime is 18149653. The next prime is 18149701. The reversal of 18149663 is 36694181.

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

It is not a de Polignac number, because 18149663 - 2⁸ = 18149407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18149653) 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, 41603 + ... + 42036.

It is an arithmetic number, because the mean of its divisors is an integer number (2676480).

Almost surely, 2^18149663 is an apocalyptic number.

18149663 is a deficient number, since it is larger than the sum of its proper divisors (3262177).

18149663 is an equidigital number, since it uses as much as digits as its factorization.

18149663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83677.

The product of its digits is 31104, while the sum is 38.

The square root of 18149663 is about 4260.2421292692. The cubic root of 18149663 is about 262.7984837516.

The spelling of 18149663 in words is "eighteen million, one hundred forty-nine thousand, six hundred sixty-three".