16552621 has 8 divisors (see below), whose sum is σ = 16755200. Its totient is φ = 16351632.

The previous prime is 16552619. The next prime is 16552651. The reversal of 16552621 is 12625561.

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 16552621 - 2¹ = 16552619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16552621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16552651) 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, 44191 + ... + 44563.

It is an arithmetic number, because the mean of its divisors is an integer number (2094400).

Almost surely, 2^16552621 is an apocalyptic number.

It is an amenable number.

16552621 is a deficient number, since it is larger than the sum of its proper divisors (202579).

16552621 is a wasteful number, since it uses less digits than its factorization.

16552621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795.

The product of its digits is 3600, while the sum is 28.

The square root of 16552621 is about 4068.4912436922. The cubic root of 16552621 is about 254.8525149971.

The spelling of 16552621 in words is "sixteen million, five hundred fifty-two thousand, six hundred twenty-one".