1566660 has 24 divisors (see below), whose sum is σ = 4386816. Its totient is φ = 417760.

The previous prime is 1566659. The next prime is 1566673. The reversal of 1566660 is 666651.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 7 ways as a sum of consecutive naturals, for example, 12996 + ... + 13115.

It is an arithmetic number, because the mean of its divisors is an integer number (182784).

2^1566660 is an apocalyptic number.

1566660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1566660 is an abundant number, since it is smaller than the sum of its proper divisors (2820156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1566660 is a wasteful number, since it uses less digits than its factorization.

1566660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26123 (or 26121 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1566660 is about 1251.6628939135. The cubic root of 1566660 is about 116.1426109670.

Subtracting from 1566660 its reverse (666651), we obtain a palindrome (900009).

The spelling of 1566660 in words is "one million, five hundred sixty-six thousand, six hundred sixty".