16520625 has 80 divisors (see below), whose sum is σ = 33739200. Its totient is φ = 7920000.

The previous prime is 16520597. The next prime is 16520627. The reversal of 16520625 is 52602561.

16520625 is a `hidden beast` number, since 1 + 652 + 0 + 6 + 2 + 5 = 666.

It is not a de Polignac number, because 16520625 - 2⁵ = 16520593 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (16520627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 185581 + ... + 185669.

It is an arithmetic number, because the mean of its divisors is an integer number (421740).

Almost surely, 2^16520625 is an apocalyptic number.

16520625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16520625 is an abundant number, since it is smaller than the sum of its proper divisors (17218575).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16520625 is an equidigital number, since it uses as much as digits as its factorization.

16520625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 16520625 is about 4064.5571714518. The cubic root of 16520625 is about 254.6882002189.

Adding to 16520625 its product of nonzero digits (3600), we get a square (16524225 = 4065²).

The spelling of 16520625 in words is "sixteen million, five hundred twenty thousand, six hundred twenty-five".