66109368645 has 96 divisors (see below), whose sum is σ = 125577843840. Its totient is φ = 33400633824.

The previous prime is 66109368631. The next prime is 66109368751. The reversal of 66109368645 is 54686390166.

It is not a de Polignac number, because 66109368645 - 2⁷ = 66109368517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66109368591 and 66109368600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3939162 + ... + 3955908.

It is an arithmetic number, because the mean of its divisors is an integer number (1308102540).

Almost surely, 2^66109368645 is an apocalyptic number.

It is an amenable number.

66109368645 is a deficient number, since it is larger than the sum of its proper divisors (59468475195).

66109368645 is an equidigital number, since it uses as much as digits as its factorization.

66109368645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16811 (or 16774 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 66109368645 in words is "sixty-six billion, one hundred nine million, three hundred sixty-eight thousand, six hundred forty-five".