18661562 has 8 divisors (see below), whose sum is σ = 28036800. Its totient is φ = 9315964.

The previous prime is 18661561. The next prime is 18661567. The reversal of 18661562 is 26516681.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (18661561) 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 3 ways as a sum of consecutive naturals, for example, 5762 + ... + 8397.

It is an arithmetic number, because the mean of its divisors is an integer number (3504600).

Almost surely, 2^18661562 is an apocalyptic number.

18661562 is a deficient number, since it is larger than the sum of its proper divisors (9375238).

18661562 is a wasteful number, since it uses less digits than its factorization.

18661562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14820.

The product of its digits is 17280, while the sum is 35.

The square root of 18661562 is about 4319.9030081704. The cubic root of 18661562 is about 265.2462976544.

The spelling of 18661562 in words is "eighteen million, six hundred sixty-one thousand, five hundred sixty-two".