66785814792 has 96 divisors (see below), whose sum is σ = 192152731680. Its totient is φ = 21718938240.

The previous prime is 66785814787. The next prime is 66785814841. The reversal of 66785814792 is 29741858766.

66785814792 is a `hidden beast` number, since 6 + 6 + 7 + 8 + 581 + 47 + 9 + 2 = 666.

66785814792 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×66785814792³ (a number of 33 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 339258 + ... + 498665.

It is an arithmetic number, because the mean of its divisors is an integer number (2001590955).

Almost surely, 2^66785814792 is an apocalyptic number.

It is an amenable number.

66785814792 is an abundant number, since it is smaller than the sum of its proper divisors (125366916888).

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

66785814792 is a wasteful number, since it uses less digits than its factorization.

66785814792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837985 (or 837969 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 66785814792 in words is "sixty-six billion, seven hundred eighty-five million, eight hundred fourteen thousand, seven hundred ninety-two".