66330685577 has 4 divisors (see below), whose sum is σ = 71433046020. Its totient is φ = 61228325136.

The previous prime is 66330685567. The next prime is 66330685613. The reversal of 66330685577 is 77558603366.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17809169401 + 48521516176 = 133451^2 + 220276^2 .

It is a cyclic number.

It is not a de Polignac number, because 66330685577 - 2⁸ = 66330685321 is a prime.

It is a super-2 number, since 2×66330685577² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66330685567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2551180202 + ... + 2551180227.

It is an arithmetic number, because the mean of its divisors is an integer number (17858261505).

Almost surely, 2^66330685577 is an apocalyptic number.

It is an amenable number.

66330685577 is a deficient number, since it is larger than the sum of its proper divisors (5102360443).

66330685577 is a wasteful number, since it uses less digits than its factorization.

66330685577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5102360442.

The product of its (nonzero) digits is 19051200, while the sum is 56.

The spelling of 66330685577 in words is "sixty-six billion, three hundred thirty million, six hundred eighty-five thousand, five hundred seventy-seven".