66575064378 has 64 divisors (see below), whose sum is σ = 138881111040. Its totient is φ = 21257510400.

The previous prime is 66575064343. The next prime is 66575064389. The reversal of 66575064378 is 87346057566.

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 9104988 + ... + 9112296.

It is an arithmetic number, because the mean of its divisors is an integer number (2170017360).

Almost surely, 2^66575064378 is an apocalyptic number.

66575064378 is an abundant number, since it is smaller than the sum of its proper divisors (72306046662).

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

66575064378 is a wasteful number, since it uses less digits than its factorization.

66575064378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8023.

The product of its (nonzero) digits is 25401600, while the sum is 57.

The spelling of 66575064378 in words is "sixty-six billion, five hundred seventy-five million, sixty-four thousand, three hundred seventy-eight".