16666625 has 16 divisors (see below), whose sum is σ = 20961408. Its totient is φ = 13230000.

The previous prime is 16666621. The next prime is 16666631. The reversal of 16666625 is 52666661.

It is not a de Polignac number, because 16666625 - 2² = 16666621 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16666621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18434 + ... + 19316.

It is an arithmetic number, because the mean of its divisors is an integer number (1310088).

It is a Proth number, since it is equal to 4069 ⋅ 2¹² + 1 and 4069 < 2¹².

Almost surely, 2^16666625 is an apocalyptic number.

It is an amenable number.

16666625 is a deficient number, since it is larger than the sum of its proper divisors (4294783).

16666625 is an equidigital number, since it uses as much as digits as its factorization.

16666625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049 (or 1039 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 16666625 is about 4082.4778015318. The cubic root of 16666625 is about 255.4362646006.

The spelling of 16666625 in words is "sixteen million, six hundred sixty-six thousand, six hundred twenty-five".