1666025 has 12 divisors (see below), whose sum is σ = 2089152. Its totient is φ = 1317840.

The previous prime is 1666019. The next prime is 1666037. The reversal of 1666025 is 5206661.

It is a de Polignac number, because none of the positive numbers 2^k-1666025 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1665985 and 1666003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2252 + ... + 2898.

It is an arithmetic number, because the mean of its divisors is an integer number (174096).

2^1666025 is an apocalyptic number.

It is an amenable number.

1666025 is a deficient number, since it is larger than the sum of its proper divisors (423127).

1666025 is a wasteful number, since it uses less digits than its factorization.

1666025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1666025 is about 1290.7459083801. The cubic root of 1666025 is about 118.5478925974.

The spelling of 1666025 in words is "one million, six hundred sixty-six thousand, twenty-five".