18048661 has 4 divisors (see below), whose sum is σ = 18318112. Its totient is φ = 17779212.

The previous prime is 18048649. The next prime is 18048683. The reversal of 18048661 is 16684081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18048661 - 2⁷ = 18048533 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 (18048601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134625 + ... + 134758.

It is an arithmetic number, because the mean of its divisors is an integer number (4579528).

Almost surely, 2^18048661 is an apocalyptic number.

It is an amenable number.

18048661 is a deficient number, since it is larger than the sum of its proper divisors (269451).

18048661 is an equidigital number, since it uses as much as digits as its factorization.

18048661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269450.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18048661 is about 4248.3715703785. The cubic root of 18048661 is about 262.3100896989.

It can be divided in two parts, 180 and 48661, that added together give a square (48841 = 221²).

The spelling of 18048661 in words is "eighteen million, forty-eight thousand, six hundred sixty-one".