66381861683 has 8 divisors (see below), whose sum is σ = 67304105856. Its totient is φ = 65459966400.

The previous prime is 66381861671. The next prime is 66381861691. The reversal of 66381861683 is 38616818366.

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 66381861683 - 2¹⁰ = 66381860659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66381861083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308318 + ... + 477308.

It is an arithmetic number, because the mean of its divisors is an integer number (8413013232).

Almost surely, 2^66381861683 is an apocalyptic number.

66381861683 is a deficient number, since it is larger than the sum of its proper divisors (922244173).

66381861683 is a wasteful number, since it uses less digits than its factorization.

66381861683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174445.

The product of its digits is 5971968, while the sum is 56.

The spelling of 66381861683 in words is "sixty-six billion, three hundred eighty-one million, eight hundred sixty-one thousand, six hundred eighty-three".