66564466446566 has 32 divisors (see below), whose sum is σ = 115488288679968. Its totient is φ = 28437927344640.

The previous prime is 66564466446557. The next prime is 66564466446631.

66564466446566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66564466446493 and 66564466446502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121130945 + ... + 121679228.

It is an arithmetic number, because the mean of its divisors is an integer number (3609009021249).

Almost surely, 2^{66564466446566} is an apocalyptic number.

66564466446566 is a deficient number, since it is larger than the sum of its proper divisors (48923822233402).

66564466446566 is a wasteful number, since it uses less digits than its factorization.

66564466446566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242810936.

The product of its digits is 10749542400, while the sum is 74.

The spelling of 66564466446566 in words is "sixty-six trillion, five hundred sixty-four billion, four hundred sixty-six million, four hundred forty-six thousand, five hundred sixty-six".