16530661 has 8 divisors (see below), whose sum is σ = 18918144. Its totient is φ = 14149680.

The previous prime is 16530659. The next prime is 16530677. The reversal of 16530661 is 16603561.

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 16530661 - 2¹ = 16530659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16530611) 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, 6651 + ... + 8791.

It is an arithmetic number, because the mean of its divisors is an integer number (2364768).

Almost surely, 2^16530661 is an apocalyptic number.

It is an amenable number.

16530661 is a deficient number, since it is larger than the sum of its proper divisors (2387483).

16530661 is a wasteful number, since it uses less digits than its factorization.

16530661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3251.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 16530661 is about 4065.7915588480. The cubic root of 16530661 is about 254.7397627025.

Subtracting 16530661 from its reverse (16603561), we obtain a square (72900 = 270²).

The spelling of 16530661 in words is "sixteen million, five hundred thirty thousand, six hundred sixty-one".