16449665 has 4 divisors (see below), whose sum is σ = 19739604. Its totient is φ = 13159728.

The previous prime is 16449661. The next prime is 16449683. The reversal of 16449665 is 56694461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7711729 + 8737936 = 2777^2 + 2956^2 .

It is a cyclic number.

It is not a de Polignac number, because 16449665 - 2² = 16449661 is a prime.

It is a super-2 number, since 2×16449665² = 541182957224450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16449661) 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, 1644962 + ... + 1644971.

It is an arithmetic number, because the mean of its divisors is an integer number (4934901).

Almost surely, 2^16449665 is an apocalyptic number.

It is an amenable number.

16449665 is a deficient number, since it is larger than the sum of its proper divisors (3289939).

16449665 is an equidigital number, since it uses as much as digits as its factorization.

16449665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3289938.

The product of its digits is 155520, while the sum is 41.

The square root of 16449665 is about 4055.8186596543. The cubic root of 16449665 is about 254.3230281570.

The spelling of 16449665 in words is "sixteen million, four hundred forty-nine thousand, six hundred sixty-five".