18630661 has 8 divisors (see below), whose sum is σ = 21327104. Its totient is φ = 15942960.

The previous prime is 18630631. The next prime is 18630679. The reversal of 18630661 is 16603681.

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 18630661 - 2⁵ = 18630629 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 (18630631) 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, 3316 + ... + 6946.

It is an arithmetic number, because the mean of its divisors is an integer number (2665888).

Almost surely, 2^18630661 is an apocalyptic number.

It is an amenable number.

18630661 is a deficient number, since it is larger than the sum of its proper divisors (2696443).

18630661 is an equidigital number, since it uses as much as digits as its factorization.

18630661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4371.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 18630661 is about 4316.3249414288. The cubic root of 18630661 is about 265.0998128811.

It can be divided in two parts, 18630 and 661, that added together give a palindrome (19291).

The spelling of 18630661 in words is "eighteen million, six hundred thirty thousand, six hundred sixty-one".