66545375707 has 8 divisors (see below), whose sum is σ = 66625759440. Its totient is φ = 66465027360.

The previous prime is 66545375681. The next prime is 66545375779. The reversal of 66545375707 is 70757354566.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66545375707 - 2²⁷ = 66411157979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66545375107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6126093 + ... + 6136945.

It is an arithmetic number, because the mean of its divisors is an integer number (8328219930).

Almost surely, 2^66545375707 is an apocalyptic number.

66545375707 is a deficient number, since it is larger than the sum of its proper divisors (80383733).

66545375707 is a wasteful number, since it uses less digits than its factorization.

66545375707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17693.

The product of its (nonzero) digits is 18522000, while the sum is 55.

The spelling of 66545375707 in words is "sixty-six billion, five hundred forty-five million, three hundred seventy-five thousand, seven hundred seven".