66616755761666 has 64 divisors (see below), whose sum is σ = 110996907386112. Its totient is φ = 29730032640000.

The previous prime is 66616755761663. The next prime is 66616755761669.

66616755761666 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (66616755761663) and next prime (66616755761669).

It is a junction number, because it is equal to n+sod(n) for n = 66616755761593 and 66616755761602.

It is not an unprimeable number, because it can be changed into a prime (66616755761663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7208820806 + ... + 7208830046.

It is an arithmetic number, because the mean of its divisors is an integer number (1734326677908).

Almost surely, 2^{66616755761666} is an apocalyptic number.

66616755761666 is a deficient number, since it is larger than the sum of its proper divisors (44380151624446).

66616755761666 is a wasteful number, since it uses less digits than its factorization.

66616755761666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18459.

The product of its digits is 2057529600, while the sum is 74.

The spelling of 66616755761666 in words is "sixty-six trillion, six hundred sixteen billion, seven hundred fifty-five million, seven hundred sixty-one thousand, six hundred sixty-six".