66151181 has 2 divisors, whose sum is σ = 66151182. Its totient is φ = 66151180.

The previous prime is 66151123. The next prime is 66151193. The reversal of 66151181 is 18115166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44342281 + 21808900 = 6659^2 + 4670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66151181 is a prime.

It is a super-2 number, since 2×66151181² = 8751957495389522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66151681) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33075590 + 33075591.

It is an arithmetic number, because the mean of its divisors is an integer number (33075591).

Almost surely, 2^66151181 is an apocalyptic number.

It is an amenable number.

66151181 is a deficient number, since it is larger than the sum of its proper divisors (1).

66151181 is an equidigital number, since it uses as much as digits as its factorization.

66151181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 29.

The square root of 66151181 is about 8133.3376297803. The cubic root of 66151181 is about 404.4323317636.

The spelling of 66151181 in words is "sixty-six million, one hundred fifty-one thousand, one hundred eighty-one".