66586977968551 has 2 divisors, whose sum is σ = 66586977968552. Its totient is φ = 66586977968550.

The previous prime is 66586977968531. The next prime is 66586977968593. The reversal of 66586977968551 is 15586977968566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66586977968551 - 2²¹ = 66586975871399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66586977968531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33293488984275 + 33293488984276.

It is an arithmetic number, because the mean of its divisors is an integer number (33293488984276).

Almost surely, 2^{66586977968551} is an apocalyptic number.

66586977968551 is a deficient number, since it is larger than the sum of its proper divisors (1).

66586977968551 is an equidigital number, since it uses as much as digits as its factorization.

66586977968551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41150592000, while the sum is 88.

The spelling of 66586977968551 in words is "sixty-six trillion, five hundred eighty-six billion, nine hundred seventy-seven million, nine hundred sixty-eight thousand, five hundred fifty-one".