66586977968565 has 16 divisors (see below), whose sum is σ = 106963623579456. Its totient is φ = 35371568640000.

The previous prime is 66586977968551. The next prime is 66586977968593. The reversal of 66586977968565 is 56586977968566.

It is not a de Polignac number, because 66586977968565 - 2⁸ = 66586977968309 is a prime.

It is a Curzon number.

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, 8842888396 + ... + 8842895925.

It is an arithmetic number, because the mean of its divisors is an integer number (6685226473716).

Almost surely, 2^{66586977968565} is an apocalyptic number.

It is an amenable number.

66586977968565 is a deficient number, since it is larger than the sum of its proper divisors (40376645610891).

66586977968565 is a wasteful number, since it uses less digits than its factorization.

66586977968565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17685784580.

The product of its digits is 246903552000, while the sum is 93.

Subtracting from 66586977968565 its reverse (56586977968566), we obtain a palindrome (9999999999999).

The spelling of 66586977968565 in words is "sixty-six trillion, five hundred eighty-six billion, nine hundred seventy-seven million, nine hundred sixty-eight thousand, five hundred sixty-five".