3820857666 has 8 divisors (see below), whose sum is σ = 7641715344. Its totient is φ = 1273619220.

The previous prime is 3820857659. The next prime is 3820857679. The reversal of 3820857666 is 6667580283.

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

3820857666 is an admirable number.

It is an unprimeable number.

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, 318404800 + ... + 318404811.

It is an arithmetic number, because the mean of its divisors is an integer number (955214418).

Almost surely, 2^3820857666 is an apocalyptic number.

3820857666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

3820857666 is a wasteful number, since it uses less digits than its factorization.

3820857666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636809616.

The product of its (nonzero) digits is 2903040, while the sum is 51.

The square root of 3820857666 is about 61813.0865270454. The cubic root of 3820857666 is about 1563.3406476361.

The spelling of 3820857666 in words is "three billion, eight hundred twenty million, eight hundred fifty-seven thousand, six hundred sixty-six".