66740437542271 has 2 divisors, whose sum is σ = 66740437542272. Its totient is φ = 66740437542270.

The previous prime is 66740437542221. The next prime is 66740437542313. The reversal of 66740437542271 is 17224573404766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66740437542271 - 2¹¹ = 66740437540223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66740437542221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33370218771135 + 33370218771136.

It is an arithmetic number, because the mean of its divisors is an integer number (33370218771136).

Almost surely, 2^{66740437542271} is an apocalyptic number.

66740437542271 is a deficient number, since it is larger than the sum of its proper divisors (1).

66740437542271 is an equidigital number, since it uses as much as digits as its factorization.

66740437542271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47416320, while the sum is 58.

The spelling of 66740437542271 in words is "sixty-six trillion, seven hundred forty billion, four hundred thirty-seven million, five hundred forty-two thousand, two hundred seventy-one".