16622661 has 8 divisors (see below), whose sum is σ = 24178464. Its totient is φ = 10074320.

The previous prime is 16622647. The next prime is 16622677.

16622661 is nontrivially palindromic in base 10.

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 16622661 - 2¹⁹ = 16098373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16624661) by changing a digit.

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, 251826 + ... + 251891.

It is an arithmetic number, because the mean of its divisors is an integer number (3022308).

Almost surely, 2^16622661 is an apocalyptic number.

16622661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16622661 is a deficient number, since it is larger than the sum of its proper divisors (7555803).

16622661 is a wasteful number, since it uses less digits than its factorization.

16622661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503731.

The product of its digits is 5184, while the sum is 30.

The square root of 16622661 is about 4077.0897709028. The cubic root of 16622661 is about 255.2114662632.

The spelling of 16622661 in words is "sixteen million, six hundred twenty-two thousand, six hundred sixty-one".