18661010 has 8 divisors (see below), whose sum is σ = 33589836. Its totient is φ = 7464400.

The previous prime is 18661009. The next prime is 18661043. The reversal of 18661010 is 1016681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18498601 + 162409 = 4301^2 + 403^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933041 + ... + 933060.

Almost surely, 2^18661010 is an apocalyptic number.

18661010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18661010 is a deficient number, since it is larger than the sum of its proper divisors (14928826).

18661010 is a wasteful number, since it uses less digits than its factorization.

18661010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866108.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 18661010 is about 4319.8391173746. The cubic root of 18661010 is about 265.2436823428.

Adding to 18661010 its reverse (1016681), we get a palindrome (19677691).

The spelling of 18661010 in words is "eighteen million, six hundred sixty-one thousand, ten".