66681468140 has 24 divisors (see below), whose sum is σ = 160035523872. Its totient is φ = 22862217600.

The previous prime is 66681468059. The next prime is 66681468209. The reversal of 66681468140 is 4186418666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238147961 + ... + 238148240.

It is an arithmetic number, because the mean of its divisors is an integer number (6668146828).

Almost surely, 2^66681468140 is an apocalyptic number.

It is an amenable number.

66681468140 is an abundant number, since it is smaller than the sum of its proper divisors (93354055732).

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

66681468140 is a wasteful number, since it uses less digits than its factorization.

66681468140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476296217 (or 476296215 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 50.

The spelling of 66681468140 in words is "sixty-six billion, six hundred eighty-one million, four hundred sixty-eight thousand, one hundred forty".