66868132591 has 16 divisors (see below), whose sum is σ = 72669758560. Its totient is φ = 61163061120.

The previous prime is 66868132579. The next prime is 66868132739. The reversal of 66868132591 is 19523186866.

It is a cyclic number.

It is not a de Polignac number, because 66868132591 - 2¹⁹ = 66867608303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66866132591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574921 + ... + 681373.

It is an arithmetic number, because the mean of its divisors is an integer number (4541859910).

Almost surely, 2^66868132591 is an apocalyptic number.

66868132591 is a deficient number, since it is larger than the sum of its proper divisors (5801625969).

66868132591 is a wasteful number, since it uses less digits than its factorization.

66868132591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106906.

The product of its digits is 3732480, while the sum is 55.

The spelling of 66868132591 in words is "sixty-six billion, eight hundred sixty-eight million, one hundred thirty-two thousand, five hundred ninety-one".