16640325 has 36 divisors (see below), whose sum is σ = 32102980. Its totient is φ = 8190720.

The previous prime is 16640317. The next prime is 16640329. The reversal of 16640325 is 52304661.

16640325 is a `hidden beast` number, since 16 + 640 + 3 + 2 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 42849 + 16597476 = 207^2 + 4074^2 .

It is not a de Polignac number, because 16640325 - 2³ = 16640317 is a prime.

It is a super-2 number, since 2×16640325² = 553800832211250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640329) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 81 + ... + 5769.

Almost surely, 2^16640325 is an apocalyptic number.

16640325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16640325 is a deficient number, since it is larger than the sum of its proper divisors (15462655).

16640325 is a wasteful number, since it uses less digits than its factorization.

16640325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5718 (or 5710 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 16640325 is about 4079.2554467697. The cubic root of 16640325 is about 255.3018340541.

Adding to 16640325 its reverse (52304661), we get a palindrome (68944986).

The spelling of 16640325 in words is "sixteen million, six hundred forty thousand, three hundred twenty-five".