18579661 has 8 divisors (see below), whose sum is σ = 19186200. Its totient is φ = 17978688.

The previous prime is 18579647. The next prime is 18579667. The reversal of 18579661 is 16697581.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16080100 + 2499561 = 4010^2 + 1581^2 .

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 18579661 - 2¹⁵ = 18546893 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 (18579667) 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, 6015 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (2398275).

Almost surely, 2^18579661 is an apocalyptic number.

It is an amenable number.

18579661 is a deficient number, since it is larger than the sum of its proper divisors (606539).

18579661 is a wasteful number, since it uses less digits than its factorization.

18579661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783.

The product of its digits is 90720, while the sum is 43.

The square root of 18579661 is about 4310.4130892526. The cubic root of 18579661 is about 264.8576950449.

The spelling of 18579661 in words is "eighteen million, five hundred seventy-nine thousand, six hundred sixty-one".