66681570378 has 16 divisors (see below), whose sum is σ = 135549422496. Its totient is φ = 21862809840.

The previous prime is 66681570269. The next prime is 66681570379. The reversal of 66681570378 is 87307518666.

It is not an unprimeable number, because it can be changed into a prime (66681570379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91094676 + ... + 91095407.

It is an arithmetic number, because the mean of its divisors is an integer number (8471838906).

Almost surely, 2^66681570378 is an apocalyptic number.

66681570378 is an abundant number, since it is smaller than the sum of its proper divisors (68867852118).

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

66681570378 is a wasteful number, since it uses less digits than its factorization.

66681570378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182190149.

The product of its (nonzero) digits is 10160640, while the sum is 57.

The spelling of 66681570378 in words is "sixty-six billion, six hundred eighty-one million, five hundred seventy thousand, three hundred seventy-eight".