1666841676 has 12 divisors (see below), whose sum is σ = 3889297272. Its totient is φ = 555613888.

The previous prime is 1666841651. The next prime is 1666841677. The reversal of 1666841676 is 6761486661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1666841676² = 5556722345700977952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666841677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69451725 + ... + 69451748.

It is an arithmetic number, because the mean of its divisors is an integer number (324108106).

Almost surely, 2^1666841676 is an apocalyptic number.

It is an amenable number.

1666841676 is an abundant number, since it is smaller than the sum of its proper divisors (2222455596).

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

1666841676 is a wasteful number, since it uses less digits than its factorization.

1666841676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138903480 (or 138903478 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The square root of 1666841676 is about 40826.9724079560. The cubic root of 1666841676 is about 1185.6725993459.

The spelling of 1666841676 in words is "one billion, six hundred sixty-six million, eight hundred forty-one thousand, six hundred seventy-six".