1066636666 has 8 divisors (see below), whose sum is σ = 1643197140. Its totient is φ = 518904288.

The previous prime is 1066636663. The next prime is 1066636691. The reversal of 1066636666 is 6666366601.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 867008025 + 199628641 = 29445^2 + 14129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1066636666² = 2275427554511191112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1066636663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7206931 + ... + 7207078.

Almost surely, 2^1066636666 is an apocalyptic number.

1066636666 is a deficient number, since it is larger than the sum of its proper divisors (576560474).

1066636666 is a wasteful number, since it uses less digits than its factorization.

1066636666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14414048.

The product of its (nonzero) digits is 839808, while the sum is 46.

The square root of 1066636666 is about 32659.4039443466. The cubic root of 1066636666 is about 1021.7363306875.

The spelling of 1066636666 in words is "one billion, sixty-six million, six hundred thirty-six thousand, six hundred sixty-six".