16616551 has 8 divisors (see below), whose sum is σ = 19015040. Its totient is φ = 14224248.

The previous prime is 16616549. The next prime is 16616563. The reversal of 16616551 is 15561661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16616551 - 2¹ = 16616549 is a prime.

It is a super-2 number, since 2×16616551² = 552219534271202, 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 (16616581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9400 + ... + 11026.

It is an arithmetic number, because the mean of its divisors is an integer number (2376880).

Almost surely, 2^16616551 is an apocalyptic number.

16616551 is a deficient number, since it is larger than the sum of its proper divisors (2398489).

16616551 is a wasteful number, since it uses less digits than its factorization.

16616551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3093.

The product of its digits is 5400, while the sum is 31.

The square root of 16616551 is about 4076.3403930486. The cubic root of 16616551 is about 255.1801930281.

The spelling of 16616551 in words is "sixteen million, six hundred sixteen thousand, five hundred fifty-one".