66103181 has 2 divisors, whose sum is σ = 66103182. Its totient is φ = 66103180.

The previous prime is 66103139. The next prime is 66103189. The reversal of 66103181 is 18130166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37576900 + 28526281 = 6130^2 + 5341^2 .

It is a cyclic number.

It is not a de Polignac number, because 66103181 - 2⁶ = 66103117 is a prime.

It is a super-2 number, since 2×66103181² = 8739261076637522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66103181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66103189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33051590 + 33051591.

It is an arithmetic number, because the mean of its divisors is an integer number (33051591).

Almost surely, 2^66103181 is an apocalyptic number.

It is an amenable number.

66103181 is a deficient number, since it is larger than the sum of its proper divisors (1).

66103181 is an equidigital number, since it uses as much as digits as its factorization.

66103181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 66103181 is about 8130.3862761864. The cubic root of 66103181 is about 404.3344879615.

The spelling of 66103181 in words is "sixty-six million, one hundred three thousand, one hundred eighty-one".