1566666 has 12 divisors (see below), whose sum is σ = 3394482. Its totient is φ = 522216.

The previous prime is 1566659. The next prime is 1566673. The reversal of 1566666 is 6666651.

It is an interprime number because it is at equal distance from previous prime (1566659) and next prime (1566673).

It can be written as a sum of positive squares in only one way, i.e., 1550025 + 16641 = 1245^2 + 129^2 .

1566666 is a modest number, since divided by 6666 gives 156 as remainder.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1566666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43501 + ... + 43536.

2^1566666 is an apocalyptic number.

1566666 is an abundant number, since it is smaller than the sum of its proper divisors (1827816).

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

1566666 is a wasteful number, since it uses less digits than its factorization.

1566666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87045 (or 87042 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 1566666 is about 1251.6652907227. The cubic root of 1566666 is about 116.1427592346.

The spelling of 1566666 in words is "one million, five hundred sixty-six thousand, six hundred sixty-six".