18661733 has 8 divisors (see below), whose sum is σ = 19964952. Its totient is φ = 17381376.

The previous prime is 18661697. The next prime is 18661739. The reversal of 18661733 is 33716681.

It can be written as a sum of positive squares in 4 ways, for example, as 10029889 + 8631844 = 3167^2 + 2938^2 .

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 18661733 - 2¹⁰ = 18660709 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 18661693 and 18661702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18661739) 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, 4010 + ... + 7307.

It is an arithmetic number, because the mean of its divisors is an integer number (2495619).

Almost surely, 2^18661733 is an apocalyptic number.

It is an amenable number.

18661733 is a deficient number, since it is larger than the sum of its proper divisors (1303219).

18661733 is a wasteful number, since it uses less digits than its factorization.

18661733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11431.

The product of its digits is 18144, while the sum is 35.

The square root of 18661733 is about 4319.9228002361. The cubic root of 18661733 is about 265.2471078220.

The spelling of 18661733 in words is "eighteen million, six hundred sixty-one thousand, seven hundred thirty-three".