66586977968566 has 24 divisors (see below), whose sum is σ = 112339129867272. Its totient is φ = 29562928903200.

The previous prime is 66586977968551. The next prime is 66586977968593.

66586977968566 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3199440775 + ... + 3199461586.

It is an arithmetic number, because the mean of its divisors is an integer number (4680797077803).

Almost surely, 2^{66586977968566} is an apocalyptic number.

66586977968566 is a deficient number, since it is larger than the sum of its proper divisors (45752151898706).

66586977968566 is a wasteful number, since it uses less digits than its factorization.

66586977968566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6398902428 (or 6398902417 counting only the distinct ones).

The product of its digits is 296284262400, while the sum is 94.

The spelling of 66586977968566 in words is "sixty-six trillion, five hundred eighty-six billion, nine hundred seventy-seven million, nine hundred sixty-eight thousand, five hundred sixty-six".