16335661 has 2 divisors, whose sum is σ = 16335662. Its totient is φ = 16335660.

The previous prime is 16335659. The next prime is 16335677. The reversal of 16335661 is 16653361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9418761 + 6916900 = 3069^2 + 2630^2 .

It is an emirp because it is prime and its reverse (16653361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16335661 - 2¹ = 16335659 is a prime.

Together with 16335659, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16335161) by changing a digit.

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 as a sum of consecutive naturals, namely, 8167830 + 8167831.

It is an arithmetic number, because the mean of its divisors is an integer number (8167831).

Almost surely, 2^16335661 is an apocalyptic number.

It is an amenable number.

16335661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16335661 is an equidigital number, since it uses as much as digits as its factorization.

16335661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 16335661 is about 4041.7398481347. The cubic root of 16335661 is about 253.7341391236.

The spelling of 16335661 in words is "sixteen million, three hundred thirty-five thousand, six hundred sixty-one".