16616651 has 6 divisors (see below), whose sum is σ = 17170956. Its totient is φ = 16079700.

The previous prime is 16616647. The next prime is 16616657. The reversal of 16616651 is 15661661.

It is not a de Polignac number, because 16616651 - 2² = 16616647 is a prime.

It is a super-2 number, since 2×16616651² = 552226180911602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16616657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7685 + ... + 9606.

It is an arithmetic number, because the mean of its divisors is an integer number (2861826).

Almost surely, 2^16616651 is an apocalyptic number.

16616651 is a deficient number, since it is larger than the sum of its proper divisors (554305).

16616651 is an equidigital number, since it uses as much as digits as its factorization.

16616651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17353 (or 17322 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 16616651 is about 4076.3526589342. The cubic root of 16616651 is about 255.1807049267.

The spelling of 16616651 in words is "sixteen million, six hundred sixteen thousand, six hundred fifty-one".