1666522 has 16 divisors (see below), whose sum is σ = 2937312. Its totient is φ = 699120.

The previous prime is 1666519. The next prime is 1666523. The reversal of 1666522 is 2256661.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1666523) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2628 + ... + 3199.

It is an arithmetic number, because the mean of its divisors is an integer number (183582).

2^1666522 is an apocalyptic number.

1666522 is a deficient number, since it is larger than the sum of its proper divisors (1270790).

1666522 is a wasteful number, since it uses less digits than its factorization.

1666522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5853.

The product of its digits is 4320, while the sum is 28.

The square root of 1666522 is about 1290.9384183608. The cubic root of 1666522 is about 118.5596796244.

The spelling of 1666522 in words is "one million, six hundred sixty-six thousand, five hundred twenty-two".