666820066674 has 8 divisors (see below), whose sum is σ = 1333640133360. Its totient is φ = 222273355556.

The previous prime is 666820066657. The next prime is 666820066721. The reversal of 666820066674 is 476660028666.

666820066674 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

666820066674 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55568338884 + ... + 55568338895.

It is an arithmetic number, because the mean of its divisors is an integer number (166705016670).

Almost surely, 2^666820066674 is an apocalyptic number.

666820066674 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.

666820066674 is a wasteful number, since it uses less digits than its factorization.

666820066674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111136677784.

The product of its (nonzero) digits is 20901888, while the sum is 57.

The spelling of 666820066674 in words is "six hundred sixty-six billion, eight hundred twenty million, sixty-six thousand, six hundred seventy-four".