66041700517 has 24 divisors (see below), whose sum is σ = 72554948424. Its totient is φ = 60074486784.

The previous prime is 66041700511. The next prime is 66041700583. The reversal of 66041700517 is 71500714066.

It can be written as a sum of positive squares in 12 ways, for example, as 41277642561 + 24764057956 = 203169^2 + 157366^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66041700517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66041700511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27596673 + ... + 27599065.

It is an arithmetic number, because the mean of its divisors is an integer number (3023122851).

Almost surely, 2^66041700517 is an apocalyptic number.

It is an amenable number.

66041700517 is a deficient number, since it is larger than the sum of its proper divisors (6513247907).

66041700517 is a wasteful number, since it uses less digits than its factorization.

66041700517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4729 (or 4716 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 66041700517 in words is "sixty-six billion, forty-one million, seven hundred thousand, five hundred seventeen".