16665516 has 72 divisors (see below), whose sum is σ = 49349664. Its totient is φ = 4642560.

The previous prime is 16665511. The next prime is 16665529. The reversal of 16665516 is 61556661.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (16665511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9526 + ... + 11138.

It is an arithmetic number, because the mean of its divisors is an integer number (685412).

Almost surely, 2^16665516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16665516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24674832).

16665516 is an abundant number, since it is smaller than the sum of its proper divisors (32684148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16665516 is a wasteful number, since it uses less digits than its factorization.

16665516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671 (or 1666 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 16665516 is about 4082.3419748963. The cubic root of 16665516 is about 255.4305988844.

The spelling of 16665516 in words is "sixteen million, six hundred sixty-five thousand, five hundred sixteen".