16653331 has 4 divisors (see below), whose sum is σ = 16698352. Its totient is φ = 16608312.

The previous prime is 16653313. The next prime is 16653361. The reversal of 16653331 is 13335661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16653331 - 2²³ = 8264723 is a prime.

It is a super-2 number, since 2×16653331² = 554666866791122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16653331.

It is not an unprimeable number, because it can be changed into a prime (16653361) 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 in 3 ways as a sum of consecutive naturals, for example, 21951 + ... + 22696.

It is an arithmetic number, because the mean of its divisors is an integer number (4174588).

Almost surely, 2^16653331 is an apocalyptic number.

16653331 is a deficient number, since it is larger than the sum of its proper divisors (45021).

16653331 is an equidigital number, since it uses as much as digits as its factorization.

16653331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45020.

The product of its digits is 4860, while the sum is 28.

The square root of 16653331 is about 4080.8492988592. The cubic root of 16653331 is about 255.3683309713.

Adding to 16653331 its reverse (13335661), we get a palindrome (29988992).

It can be divided in two parts, 1665 and 3331, that multiplied together give a triangular number (5546115 = T₃₃₃₀).

The spelling of 16653331 in words is "sixteen million, six hundred fifty-three thousand, three hundred thirty-one".