216570000181 has 2 divisors, whose sum is σ = 216570000182. Its totient is φ = 216570000180.

The previous prime is 216570000167. The next prime is 216570000217. The reversal of 216570000181 is 181000075612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198239548081 + 18330452100 = 445241^2 + 135390^2 .

It is a cyclic number.

It is not a de Polignac number, because 216570000181 - 2³⁵ = 182210261813 is a prime.

It is a super-2 number, since 2×216570000181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216570000281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108285000090 + 108285000091.

It is an arithmetic number, because the mean of its divisors is an integer number (108285000091).

Almost surely, 2^216570000181 is an apocalyptic number.

It is an amenable number.

216570000181 is a deficient number, since it is larger than the sum of its proper divisors (1).

216570000181 is an equidigital number, since it uses as much as digits as its factorization.

216570000181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 31.

Adding to 216570000181 its reverse (181000075612), we get a palindrome (397570075793).

The spelling of 216570000181 in words is "two hundred sixteen billion, five hundred seventy million, one hundred eighty-one", and thus it is an aban number.