66710231613 has 8 divisors (see below), whose sum is σ = 98829972800. Its totient is φ = 44473487724.

The previous prime is 66710231593. The next prime is 66710231639. The reversal of 66710231613 is 31613201766.

66710231613 is a `hidden beast` number, since 6 + 6 + 7 + 1 + 0 + 2 + 31 + 613 = 666.

It is not a de Polignac number, because 66710231613 - 2²⁴ = 66693454397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66710231213) 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, 1235374633 + ... + 1235374686.

It is an arithmetic number, because the mean of its divisors is an integer number (12353746600).

Almost surely, 2^66710231613 is an apocalyptic number.

It is an amenable number.

66710231613 is a deficient number, since it is larger than the sum of its proper divisors (32119741187).

66710231613 is a wasteful number, since it uses less digits than its factorization.

66710231613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470749328 (or 2470749322 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The spelling of 66710231613 in words is "sixty-six billion, seven hundred ten million, two hundred thirty-one thousand, six hundred thirteen".