66378071875 has 60 divisors (see below), whose sum is σ = 89460367920. Its totient is φ = 49155150000.

The previous prime is 66378071873. The next prime is 66378071887. The reversal of 66378071875 is 57817087366.

It is not a de Polignac number, because 66378071875 - 2¹ = 66378071873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66378071873) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2141228110 + ... + 2141228140.

It is an arithmetic number, because the mean of its divisors is an integer number (1491006132).

Almost surely, 2^66378071875 is an apocalyptic number.

66378071875 is a deficient number, since it is larger than the sum of its proper divisors (23082296045).

66378071875 is an frugal number, since it uses more digits than its factorization.

66378071875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 58.

The spelling of 66378071875 in words is "sixty-six billion, three hundred seventy-eight million, seventy-one thousand, eight hundred seventy-five".