16553725 has 6 divisors (see below), whose sum is σ = 20526650. Its totient is φ = 13242960.

The previous prime is 16553711. The next prime is 16553737. The reversal of 16553725 is 52735561.

It can be written as a sum of positive squares in 3 ways, for example, as 2090916 + 14462809 = 1446^2 + 3803^2 .

It is not a de Polignac number, because 16553725 - 2¹¹ = 16551677 is a prime.

It is a super-2 number, since 2×16553725² = 548051622751250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 331050 + ... + 331099.

Almost surely, 2^16553725 is an apocalyptic number.

It is an amenable number.

16553725 is a deficient number, since it is larger than the sum of its proper divisors (3972925).

16553725 is an equidigital number, since it uses as much as digits as its factorization.

16553725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662159 (or 662154 counting only the distinct ones).

The product of its digits is 31500, while the sum is 34.

The square root of 16553725 is about 4068.6269182612. The cubic root of 16553725 is about 254.8581807851.

The spelling of 16553725 in words is "sixteen million, five hundred fifty-three thousand, seven hundred twenty-five".