66752269872181 has 2 divisors, whose sum is σ = 66752269872182. Its totient is φ = 66752269872180.

The previous prime is 66752269872179. The next prime is 66752269872199. The reversal of 66752269872181 is 18127896225766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64185333980625 + 2566935891556 = 8011575^2 + 1602166^2 .

It is a cyclic number.

It is not a de Polignac number, because 66752269872181 - 2¹ = 66752269872179 is a prime.

It is a super-2 number, since 2×66752269872181² (a number of 28 digits) contains 22 as substring.

Together with 66752269872179, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66752269872181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66752269872481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33376134936090 + 33376134936091.

It is an arithmetic number, because the mean of its divisors is an integer number (33376134936091).

Almost surely, 2^{66752269872181} is an apocalyptic number.

It is an amenable number.

66752269872181 is a deficient number, since it is larger than the sum of its proper divisors (1).

66752269872181 is an equidigital number, since it uses as much as digits as its factorization.

66752269872181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 243855360, while the sum is 70.

The spelling of 66752269872181 in words is "sixty-six trillion, seven hundred fifty-two billion, two hundred sixty-nine million, eight hundred seventy-two thousand, one hundred eighty-one".