16553425 has 18 divisors (see below), whose sum is σ = 23879238. Its totient is φ = 11350080.

The previous prime is 16553413. The next prime is 16553443. The reversal of 16553425 is 52435561.

It can be written as a sum of positive squares in 3 ways, for example, as 1132096 + 15421329 = 1064^2 + 3927^2 .

It is not a de Polignac number, because 16553425 - 2¹¹ = 16551377 is a prime.

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 17 ways as a sum of consecutive naturals, for example, 5532 + ... + 7981.

Almost surely, 2^16553425 is an apocalyptic number.

It is an amenable number.

16553425 is a deficient number, since it is larger than the sum of its proper divisors (7325813).

16553425 is a wasteful number, since it uses less digits than its factorization.

16553425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13537 (or 13525 counting only the distinct ones).

The product of its digits is 18000, while the sum is 31.

The square root of 16553425 is about 4068.5900506195. The cubic root of 16553425 is about 254.8566411937.

Adding to 16553425 its reverse (52435561), we get a palindrome (68988986).

The spelling of 16553425 in words is "sixteen million, five hundred fifty-three thousand, four hundred twenty-five".