66010156165181 has 2 divisors, whose sum is σ = 66010156165182. Its totient is φ = 66010156165180.

The previous prime is 66010156165159. The next prime is 66010156165189. The reversal of 66010156165181 is 18156165101066.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64738663129156 + 1271493036025 = 8046034^2 + 1127605^2 .

It is a cyclic number.

It is not a de Polignac number, because 66010156165181 - 2⁶ = 66010156165117 is a prime.

It is a super-2 number, since 2×66010156165181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66010156165189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33005078082590 + 33005078082591.

It is an arithmetic number, because the mean of its divisors is an integer number (33005078082591).

Almost surely, 2^{66010156165181} is an apocalyptic number.

It is an amenable number.

66010156165181 is a deficient number, since it is larger than the sum of its proper divisors (1).

66010156165181 is an equidigital number, since it uses as much as digits as its factorization.

66010156165181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 47.

The spelling of 66010156165181 in words is "sixty-six trillion, ten billion, one hundred fifty-six million, one hundred sixty-five thousand, one hundred eighty-one".