16563425 has 6 divisors (see below), whose sum is σ = 20538678. Its totient is φ = 13250720.

The previous prime is 16563419. The next prime is 16563431. The reversal of 16563425 is 52436561.

It is an interprime number because it is at equal distance from previous prime (16563419) and next prime (16563431).

It can be written as a sum of positive squares in 3 ways, for example, as 1940449 + 14622976 = 1393^2 + 3824^2 .

It is not a de Polignac number, because 16563425 - 2⁴ = 16563409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16563391 and 16563400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 331244 + ... + 331293.

It is an arithmetic number, because the mean of its divisors is an integer number (3423113).

Almost surely, 2^16563425 is an apocalyptic number.

It is an amenable number.

16563425 is a deficient number, since it is larger than the sum of its proper divisors (3975253).

16563425 is an equidigital number, since it uses as much as digits as its factorization.

16563425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662547 (or 662542 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 16563425 is about 4069.8187920348. The cubic root of 16563425 is about 254.9079508851.

Adding to 16563425 its reverse (52436561), we get a palindrome (68999986).

The spelling of 16563425 in words is "sixteen million, five hundred sixty-three thousand, four hundred twenty-five".