6656180805 has 16 divisors (see below), whose sum is σ = 11833210560. Its totient is φ = 3549963024.

The previous prime is 6656180789. The next prime is 6656180809. The reversal of 6656180805 is 5080816566.

6656180805 is a `hidden beast` number, since 6 + 6 + 561 + 8 + 0 + 80 + 5 = 666.

It is not a de Polignac number, because 6656180805 - 2⁴ = 6656180789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656180809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24652387 + ... + 24652656.

It is an arithmetic number, because the mean of its divisors is an integer number (739575660).

Almost surely, 2^6656180805 is an apocalyptic number.

It is an amenable number.

6656180805 is a deficient number, since it is larger than the sum of its proper divisors (5177029755).

6656180805 is a wasteful number, since it uses less digits than its factorization.

6656180805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49305057 (or 49305051 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 6656180805 is about 81585.4202967663. The cubic root of 6656180805 is about 1881.0847825972.

The spelling of 6656180805 in words is "six billion, six hundred fifty-six million, one hundred eighty thousand, eight hundred five".