16516669 has 4 divisors (see below), whose sum is σ = 17787196. Its totient is φ = 15246144.

The previous prime is 16516667. The next prime is 16516699. The reversal of 16516669 is 96661561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96661561 = 367 ⋅263383.

It can be written as a sum of positive squares in 2 ways, for example, as 8468100 + 8048569 = 2910^2 + 2837^2 .

It is a cyclic number.

It is not a de Polignac number, because 16516669 - 2¹ = 16516667 is a prime.

It is a super-2 number, since 2×16516669² = 545600709711122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16516667) 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, 635244 + ... + 635269.

It is an arithmetic number, because the mean of its divisors is an integer number (4446799).

Almost surely, 2^16516669 is an apocalyptic number.

It is an amenable number.

16516669 is a deficient number, since it is larger than the sum of its proper divisors (1270527).

16516669 is a wasteful number, since it uses less digits than its factorization.

16516669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270526.

The product of its digits is 58320, while the sum is 40.

The square root of 16516669 is about 4064.0704964358. The cubic root of 16516669 is about 254.6678695322.

The spelling of 16516669 in words is "sixteen million, five hundred sixteen thousand, six hundred sixty-nine".