1566050666 has 4 divisors (see below), whose sum is σ = 2349076002. Its totient is φ = 783025332.

The previous prime is 1566050639. The next prime is 1566050767. The reversal of 1566050666 is 6660506651.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1561909441 + 4141225 = 39521^2 + 2035^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391512665 + ... + 391512668.

Almost surely, 2^1566050666 is an apocalyptic number.

1566050666 is a deficient number, since it is larger than the sum of its proper divisors (783025336).

1566050666 is an equidigital number, since it uses as much as digits as its factorization.

1566050666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783025335.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 1566050666 is about 39573.3580328989. The cubic root of 1566050666 is about 1161.2755157976.

The spelling of 1566050666 in words is "one billion, five hundred sixty-six million, fifty thousand, six hundred sixty-six".