16665331 has 4 divisors (see below), whose sum is σ = 16684200. Its totient is φ = 16646464.

The previous prime is 16665301. The next prime is 16665347. The reversal of 16665331 is 13356661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16665331 is a prime.

It is a super-2 number, since 2×16665331² = 555466514679122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16665293 and 16665302.

It is not an unprimeable number, because it can be changed into a prime (16665301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8041 + ... + 9898.

It is an arithmetic number, because the mean of its divisors is an integer number (4171050).

Almost surely, 2^16665331 is an apocalyptic number.

16665331 is a deficient number, since it is larger than the sum of its proper divisors (18869).

16665331 is an equidigital number, since it uses as much as digits as its factorization.

16665331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18868.

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

The square root of 16665331 is about 4082.3193162711. The cubic root of 16665331 is about 255.4296537225.

The spelling of 16665331 in words is "sixteen million, six hundred sixty-five thousand, three hundred thirty-one".