66554645668 has 12 divisors (see below), whose sum is σ = 133109291392. Its totient is φ = 28523419560.

The previous prime is 66554645639. The next prime is 66554645687. The reversal of 66554645668 is 86654645566.

66554645668 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1188475788 + ... + 1188475843.

Almost surely, 2^66554645668 is an apocalyptic number.

It is an amenable number.

66554645668 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.

66554645668 is a wasteful number, since it uses less digits than its factorization.

66554645668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376951642 (or 2376951640 counting only the distinct ones).

The product of its digits is 124416000, while the sum is 61.

The spelling of 66554645668 in words is "sixty-six billion, five hundred fifty-four million, six hundred forty-five thousand, six hundred sixty-eight".