6661774356 has 24 divisors (see below), whose sum is σ = 15776144160. Its totient is φ = 2187448032.

The previous prime is 6661774331. The next prime is 6661774367. The reversal of 6661774356 is 6534771666.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6661774299 and 6661774308.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4142091 + ... + 4143698.

It is an arithmetic number, because the mean of its divisors is an integer number (657339340).

Almost surely, 2^6661774356 is an apocalyptic number.

It is an amenable number.

6661774356 is an abundant number, since it is smaller than the sum of its proper divisors (9114369804).

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

6661774356 is a wasteful number, since it uses less digits than its factorization.

6661774356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8285863 (or 8285861 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 51.

The square root of 6661774356 is about 81619.6934324064. The cubic root of 6661774356 is about 1881.6115610388.

The spelling of 6661774356 in words is "six billion, six hundred sixty-one million, seven hundred seventy-four thousand, three hundred fifty-six".