18677661 has 8 divisors (see below), whose sum is σ = 24924960. Its totient is φ = 12441072.

The previous prime is 18677639. The next prime is 18677669. The reversal of 18677661 is 16677681.

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

It is not a de Polignac number, because 18677661 - 2¹⁴ = 18661277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18677669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3306 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (3115620).

Almost surely, 2^18677661 is an apocalyptic number.

It is an amenable number.

18677661 is a deficient number, since it is larger than the sum of its proper divisors (6247299).

18677661 is a wasteful number, since it uses less digits than its factorization.

18677661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5355.

The product of its digits is 84672, while the sum is 42.

The square root of 18677661 is about 4321.7659584943. The cubic root of 18677661 is about 265.3225501638.

The spelling of 18677661 in words is "eighteen million, six hundred seventy-seven thousand, six hundred sixty-one".