66785858694 has 40 divisors (see below), whose sum is σ = 150044786760. Its totient is φ = 22203193824.

The previous prime is 66785858683. The next prime is 66785858837. The reversal of 66785858694 is 49685858766.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 482479 + ... + 605274.

It is an arithmetic number, because the mean of its divisors is an integer number (3751119669).

Almost surely, 2^66785858694 is an apocalyptic number.

66785858694 is an abundant number, since it is smaller than the sum of its proper divisors (83258928066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66785858694 is a wasteful number, since it uses less digits than its factorization.

66785858694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088146 (or 1088137 counting only the distinct ones).

The product of its digits is 696729600, while the sum is 72.

Adding to 66785858694 its sum of digits (72), we get a palindrome (66785858766).

The spelling of 66785858694 in words is "sixty-six billion, seven hundred eighty-five million, eight hundred fifty-eight thousand, six hundred ninety-four".