16642553 has 4 divisors (see below), whose sum is σ = 16655220. Its totient is φ = 16629888.

The previous prime is 16642529. The next prime is 16642573. The reversal of 16642553 is 35524661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35524661 = 19 ⋅1869719.

It can be written as a sum of positive squares in 2 ways, for example, as 9314704 + 7327849 = 3052^2 + 2707^2 .

It is a cyclic number.

It is not a de Polignac number, because 16642553 - 2¹⁶ = 16577017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16642513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4100 + ... + 7077.

It is an arithmetic number, because the mean of its divisors is an integer number (4163805).

Almost surely, 2^16642553 is an apocalyptic number.

It is an amenable number.

16642553 is a deficient number, since it is larger than the sum of its proper divisors (12667).

16642553 is a wasteful number, since it uses less digits than its factorization.

16642553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12666.

The product of its digits is 21600, while the sum is 32.

The square root of 16642553 is about 4079.5285266805. The cubic root of 16642553 is about 255.3132278039.

The spelling of 16642553 in words is "sixteen million, six hundred forty-two thousand, five hundred fifty-three".