16553645 has 8 divisors (see below), whose sum is σ = 20057856. Its totient is φ = 13113936.

The previous prime is 16553633. The next prime is 16553651. The reversal of 16553645 is 54635561.

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 16553645 - 2¹² = 16549549 is a prime.

It is a super-3 number, since 3×16553645³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15557 + ... + 16586.

It is an arithmetic number, because the mean of its divisors is an integer number (2507232).

Almost surely, 2^16553645 is an apocalyptic number.

It is an amenable number.

16553645 is a deficient number, since it is larger than the sum of its proper divisors (3504211).

16553645 is a wasteful number, since it uses less digits than its factorization.

16553645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32251.

The product of its digits is 54000, while the sum is 35.

The square root of 16553645 is about 4068.6170869228. The cubic root of 16553645 is about 254.8577702292.

The spelling of 16553645 in words is "sixteen million, five hundred fifty-three thousand, six hundred forty-five".