66785858766 has 36 divisors (see below), whose sum is σ = 159053379576. Its totient is φ = 20238138360.

The previous prime is 66785858683. The next prime is 66785858837.

66785858766 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66785858766² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66785858694 and 66785858703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15329746 + ... + 15334101.

Almost surely, 2^66785858766 is an apocalyptic number.

66785858766 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66785858766 is an abundant number, since it is smaller than the sum of its proper divisors (92267520810).

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

66785858766 is a wasteful number, since it uses less digits than its factorization.

66785858766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30663877 (or 30663863 counting only the distinct ones).

The product of its digits is 812851200, while the sum is 72.

The spelling of 66785858766 in words is "sixty-six billion, seven hundred eighty-five million, eight hundred fifty-eight thousand, seven hundred sixty-six".