66461791832955 has 48 divisors (see below), whose sum is σ = 123320900312064. Its totient is φ = 34302860281440.

The previous prime is 66461791832951. The next prime is 66461791832963. The reversal of 66461791832955 is 55923819716466.

It is a happy number.

66461791832955 is a `hidden beast` number, since 6 + 6 + 461 + 7 + 91 + 8 + 3 + 29 + 55 = 666.

It is not a de Polignac number, because 66461791832955 - 2² = 66461791832951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66461791832951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 882237549 + ... + 882312878.

It is an arithmetic number, because the mean of its divisors is an integer number (2569185423168).

Almost surely, 2^{66461791832955} is an apocalyptic number.

66461791832955 is a deficient number, since it is larger than the sum of its proper divisors (56859108479109).

66461791832955 is a wasteful number, since it uses less digits than its factorization.

66461791832955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764550478 (or 1764550466 counting only the distinct ones).

The product of its digits is 587865600, while the sum is 72.

The spelling of 66461791832955 in words is "sixty-six trillion, four hundred sixty-one billion, seven hundred ninety-one million, eight hundred thirty-two thousand, nine hundred fifty-five".