16530725 has 18 divisors (see below), whose sum is σ = 21346290. Its totient is φ = 12684000.

The previous prime is 16530707. The next prime is 16530727. The reversal of 16530725 is 52703561.

It can be written as a sum of positive squares in 3 ways, for example, as 1117249 + 15413476 = 1057^2 + 3926^2 .

It is not a de Polignac number, because 16530725 - 2¹⁰ = 16529701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16530727) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 109400 + ... + 109550.

It is an arithmetic number, because the mean of its divisors is an integer number (1185905).

Almost surely, 2^16530725 is an apocalyptic number.

It is an amenable number.

16530725 is a deficient number, since it is larger than the sum of its proper divisors (4815565).

16530725 is an equidigital number, since it uses as much as digits as its factorization.

16530725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 16530725 is about 4065.7994293866. The cubic root of 16530725 is about 254.7400914516.

Multiplying 16530725 by its sum of digits (29), we get a square (479391025 = 21895²).

16530725 divided by its sum of digits (29) gives a square (570025 = 755²).

The spelling of 16530725 in words is "sixteen million, five hundred thirty thousand, seven hundred twenty-five".