16666425 has 24 divisors (see below), whose sum is σ = 30618080. Its totient is φ = 8888400.

The previous prime is 16666423. The next prime is 16666453. The reversal of 16666425 is 52466661.

It is a happy number.

It is not a de Polignac number, because 16666425 - 2¹ = 16666423 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16666425.

It is not an unprimeable number, because it can be changed into a prime (16666423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11671 + ... + 13020.

Almost surely, 2^16666425 is an apocalyptic number.

16666425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16666425 is a deficient number, since it is larger than the sum of its proper divisors (13951655).

16666425 is a wasteful number, since it uses less digits than its factorization.

16666425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24710 (or 24699 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 16666425 is about 4082.4533065303. The cubic root of 16666425 is about 255.4352428489.

The spelling of 16666425 in words is "sixteen million, six hundred sixty-six thousand, four hundred twenty-five".