16530553 has 8 divisors (see below), whose sum is σ = 17851400. Its totient is φ = 15216768.

The previous prime is 16530539. The next prime is 16530571. The reversal of 16530553 is 35503561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1140624 + 15389929 = 1068^2 + 3923^2 .

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 16530553 - 2²¹ = 14433401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16530523) 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, 3763 + ... + 6871.

It is an arithmetic number, because the mean of its divisors is an integer number (2231425).

Almost surely, 2^16530553 is an apocalyptic number.

16530553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16530553 is a deficient number, since it is larger than the sum of its proper divisors (1320847).

16530553 is a wasteful number, since it uses less digits than its factorization.

16530553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3531.

The product of its (nonzero) digits is 6750, while the sum is 28.

The square root of 16530553 is about 4065.7782772798. The cubic root of 16530553 is about 254.7392079363.

It can be divided in two parts, 16 and 530553, that multiplied together give a palindrome (8488848).

The spelling of 16530553 in words is "sixteen million, five hundred thirty thousand, five hundred fifty-three".