66001765577 has 12 divisors (see below), whose sum is σ = 73736705028. Its totient is φ = 59017965600.

The previous prime is 66001765567. The next prime is 66001765597. The reversal of 66001765577 is 77556710066.

It can be written as a sum of positive squares in 2 ways, for example, as 35427144841 + 30574620736 = 188221^2 + 174856^2 .

It is not a de Polignac number, because 66001765577 - 2⁸ = 66001765321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66001765547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4463678 + ... + 4478439.

It is an arithmetic number, because the mean of its divisors is an integer number (6144725419).

Almost surely, 2^66001765577 is an apocalyptic number.

It is an amenable number.

66001765577 is a deficient number, since it is larger than the sum of its proper divisors (7734939451).

66001765577 is a wasteful number, since it uses less digits than its factorization.

66001765577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8942200 (or 8942189 counting only the distinct ones).

The product of its (nonzero) digits is 1852200, while the sum is 50.

The spelling of 66001765577 in words is "sixty-six billion, one million, seven hundred sixty-five thousand, five hundred seventy-seven".