16691616 has 48 divisors (see below), whose sum is σ = 48686400. Its totient is φ = 5563584.

The previous prime is 16691593. The next prime is 16691621. The reversal of 16691616 is 61619661.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×16691616² = 557220089382912, which contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8796 + ... + 10523.

It is an arithmetic number, because the mean of its divisors is an integer number (1014300).

Almost surely, 2^16691616 is an apocalyptic number.

16691616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16691616 is an abundant number, since it is smaller than the sum of its proper divisors (31994784).

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

16691616 is a wasteful number, since it uses less digits than its factorization.

16691616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19338 (or 19324 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 16691616 is about 4085.5374187492. The cubic root of 16691616 is about 255.5638733133.

The spelling of 16691616 in words is "sixteen million, six hundred ninety-one thousand, six hundred sixteen".