16665425 has 12 divisors (see below), whose sum is σ = 23617536. Its totient is φ = 11427600.

The previous prime is 16665421. The next prime is 16665433. The reversal of 16665425 is 52456661.

It is not a de Polignac number, because 16665425 - 2² = 16665421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16665421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47441 + ... + 47790.

It is an arithmetic number, because the mean of its divisors is an integer number (1968128).

Almost surely, 2^16665425 is an apocalyptic number.

It is an amenable number.

16665425 is a deficient number, since it is larger than the sum of its proper divisors (6952111).

16665425 is an equidigital number, since it uses as much as digits as its factorization.

16665425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95248 (or 95243 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 16665425 is about 4082.3308293180. The cubic root of 16665425 is about 255.4301339678.

The spelling of 16665425 in words is "sixteen million, six hundred sixty-five thousand, four hundred twenty-five".