16600661 has 24 divisors (see below), whose sum is σ = 22188960. Its totient is φ = 12247200.

The previous prime is 16600627. The next prime is 16600669.

16600661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 16600661 - 2¹⁰ = 16599637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16600661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16600669) 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, 9431 + ... + 11051.

It is an arithmetic number, because the mean of its divisors is an integer number (924540).

Almost surely, 2^16600661 is an apocalyptic number.

16600661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16600661 is a deficient number, since it is larger than the sum of its proper divisors (5588299).

16600661 is a wasteful number, since it uses less digits than its factorization.

16600661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665 (or 1658 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 16600661 is about 4074.3908747198. The cubic root of 16600661 is about 255.0988262338.

The spelling of 16600661 in words is "sixteen million, six hundred thousand, six hundred sixty-one".