18352661 has 2 divisors, whose sum is σ = 18352662. Its totient is φ = 18352660.

The previous prime is 18352637. The next prime is 18352667. The reversal of 18352661 is 16625381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10201636 + 8151025 = 3194^2 + 2855^2 .

It is a cyclic number.

It is not a de Polignac number, because 18352661 - 2¹⁰ = 18351637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18352667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9176330 + 9176331.

It is an arithmetic number, because the mean of its divisors is an integer number (9176331).

Almost surely, 2^18352661 is an apocalyptic number.

It is an amenable number.

18352661 is a deficient number, since it is larger than the sum of its proper divisors (1).

18352661 is an equidigital number, since it uses as much as digits as its factorization.

18352661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 18352661 is about 4284.0005835667. Note that the first 3 decimals coincide. The cubic root of 18352661 is about 263.7746249554.

The spelling of 18352661 in words is "eighteen million, three hundred fifty-two thousand, six hundred sixty-one".