18276661 has 8 divisors (see below), whose sum is σ = 19721240. Its totient is φ = 16837632.

The previous prime is 18276653. The next prime is 18276673. The reversal of 18276661 is 16667281.

It can be written as a sum of positive squares in 4 ways, for example, as 1874161 + 16402500 = 1369^2 + 4050^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18276661 - 2³ = 18276653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18276661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18276761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7705 + ... + 9793.

It is an arithmetic number, because the mean of its divisors is an integer number (2465155).

Almost surely, 2^18276661 is an apocalyptic number.

It is an amenable number.

18276661 is a deficient number, since it is larger than the sum of its proper divisors (1444579).

18276661 is a wasteful number, since it uses less digits than its factorization.

18276661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775.

The product of its digits is 24192, while the sum is 37.

The square root of 18276661 is about 4275.1211678735. The cubic root of 18276661 is about 263.4100164790.

The spelling of 18276661 in words is "eighteen million, two hundred seventy-six thousand, six hundred sixty-one".