66195707805 has 48 divisors (see below), whose sum is σ = 124073524224. Its totient is φ = 32520660480.

The previous prime is 66195707801. The next prime is 66195707833. The reversal of 66195707805 is 50870759166.

66195707805 is a `hidden beast` number, since 6 + 61 + 9 + 570 + 7 + 8 + 0 + 5 = 666.

It is not a de Polignac number, because 66195707805 - 2² = 66195707801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66195707801) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 884581 + ... + 956490.

It is an arithmetic number, because the mean of its divisors is an integer number (2584865088).

Almost surely, 2^66195707805 is an apocalyptic number.

It is an amenable number.

66195707805 is a deficient number, since it is larger than the sum of its proper divisors (57877816419).

66195707805 is a wasteful number, since it uses less digits than its factorization.

66195707805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841146 (or 1841143 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 54.

The spelling of 66195707805 in words is "sixty-six billion, one hundred ninety-five million, seven hundred seven thousand, eight hundred five".