16680425 has 12 divisors (see below), whose sum is σ = 21075660. Its totient is φ = 13091520.

The previous prime is 16680403. The next prime is 16680457. The reversal of 16680425 is 52408661.

It can be written as a sum of positive squares in 6 ways, for example, as 1227664 + 15452761 = 1108^2 + 3931^2 .

It is not a de Polignac number, because 16680425 - 2¹² = 16676329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16680391 and 16680400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4970 + ... + 7619.

It is an arithmetic number, because the mean of its divisors is an integer number (1756305).

Almost surely, 2^16680425 is an apocalyptic number.

It is an amenable number.

16680425 is a deficient number, since it is larger than the sum of its proper divisors (4395235).

16680425 is a wasteful number, since it uses less digits than its factorization.

16680425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12652 (or 12647 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 16680425 is about 4084.1676018499. The cubic root of 16680425 is about 255.5067457366.

The spelling of 16680425 in words is "sixteen million, six hundred eighty thousand, four hundred twenty-five".