18245661 has 8 divisors (see below), whose sum is σ = 27802944. Its totient is φ = 10426080.

The previous prime is 18245659. The next prime is 18245663. The reversal of 18245661 is 16654281.

It is an interprime number because it is at equal distance from previous prime (18245659) and next prime (18245663).

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

It is not a de Polignac number, because 18245661 - 2¹ = 18245659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18245663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434400 + ... + 434441.

It is an arithmetic number, because the mean of its divisors is an integer number (3475368).

Almost surely, 2^18245661 is an apocalyptic number.

It is an amenable number.

18245661 is a deficient number, since it is larger than the sum of its proper divisors (9557283).

18245661 is an equidigital number, since it uses as much as digits as its factorization.

18245661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868851.

The product of its digits is 11520, while the sum is 33.

The square root of 18245661 is about 4271.4940009322. The cubic root of 18245661 is about 263.2610043659.

The spelling of 18245661 in words is "eighteen million, two hundred forty-five thousand, six hundred sixty-one".