66775375945 has 16 divisors (see below), whose sum is σ = 83621538432. Its totient is φ = 51093306880.

The previous prime is 66775375937. The next prime is 66775376027. The reversal of 66775375945 is 54957357766.

It is not a de Polignac number, because 66775375945 - 2³ = 66775375937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2146905 + ... + 2177785.

It is an arithmetic number, because the mean of its divisors is an integer number (5226346152).

Almost surely, 2^66775375945 is an apocalyptic number.

It is an amenable number.

66775375945 is a deficient number, since it is larger than the sum of its proper divisors (16846162487).

66775375945 is a wasteful number, since it uses less digits than its factorization.

66775375945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49712.

The product of its digits is 166698000, while the sum is 64.

The spelling of 66775375945 in words is "sixty-six billion, seven hundred seventy-five million, three hundred seventy-five thousand, nine hundred forty-five".