66080572737577 has 4 divisors (see below), whose sum is σ = 66136525806276. Its totient is φ = 66024619668880.

The previous prime is 66080572737563. The next prime is 66080572737637. The reversal of 66080572737577 is 77573727508066.

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 35255913153561 + 30824659584016 = 5937669^2 + 5551996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66080572737577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66080572707577) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 27976532578 + ... + 27976534939.

It is an arithmetic number, because the mean of its divisors is an integer number (16534131451569).

Almost surely, 2^{66080572737577} is an apocalyptic number.

It is an amenable number.

66080572737577 is a deficient number, since it is larger than the sum of its proper divisors (55953068699).

66080572737577 is a wasteful number, since it uses less digits than its factorization.

66080572737577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55953068698.

The product of its (nonzero) digits is 726062400, while the sum is 70.

The spelling of 66080572737577 in words is "sixty-six trillion, eighty billion, five hundred seventy-two million, seven hundred thirty-seven thousand, five hundred seventy-seven".