1666766851 has 8 divisors (see below), whose sum is σ = 1740063600. Its totient is φ = 1594524960.

The previous prime is 1666766831. The next prime is 1666766873. The reversal of 1666766851 is 1586676661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1666766851 - 2¹⁷ = 1666635779 is a prime.

It is a super-2 number, since 2×1666766851² = 5556223471184912402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666766831) by changing a digit.

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, 260485 + ... + 266806.

It is an arithmetic number, because the mean of its divisors is an integer number (217507950).

Almost surely, 2^1666766851 is an apocalyptic number.

1666766851 is a deficient number, since it is larger than the sum of its proper divisors (73296749).

1666766851 is a wasteful number, since it uses less digits than its factorization.

1666766851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527429.

The product of its digits is 2177280, while the sum is 52.

The square root of 1666766851 is about 40826.0560304323. The cubic root of 1666766851 is about 1185.6548573530.

The spelling of 1666766851 in words is "one billion, six hundred sixty-six million, seven hundred sixty-six thousand, eight hundred fifty-one".