66971827231 has 2 divisors, whose sum is σ = 66971827232. Its totient is φ = 66971827230.

The previous prime is 66971827217. The next prime is 66971827259. The reversal of 66971827231 is 13272817966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66971827231 - 2¹⁷ = 66971696159 is a prime.

It is a super-2 number, since 2×66971827231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66971827201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33485913615 + 33485913616.

It is an arithmetic number, because the mean of its divisors is an integer number (33485913616).

Almost surely, 2^66971827231 is an apocalyptic number.

66971827231 is a deficient number, since it is larger than the sum of its proper divisors (1).

66971827231 is an equidigital number, since it uses as much as digits as its factorization.

66971827231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The spelling of 66971827231 in words is "sixty-six billion, nine hundred seventy-one million, eight hundred twenty-seven thousand, two hundred thirty-one".