66166161073 has 2 divisors, whose sum is σ = 66166161074. Its totient is φ = 66166161072.

The previous prime is 66166161041. The next prime is 66166161121. The reversal of 66166161073 is 37016166166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66145667344 + 20493729 = 257188^2 + 4527^2 .

It is a cyclic number.

It is not a de Polignac number, because 66166161073 - 2⁵ = 66166161041 is a prime.

It is a super-2 number, since 2×66166161073² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66166101073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33083080536 + 33083080537.

It is an arithmetic number, because the mean of its divisors is an integer number (33083080537).

Almost surely, 2^66166161073 is an apocalyptic number.

It is an amenable number.

66166161073 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166161073 is an equidigital number, since it uses as much as digits as its factorization.

66166161073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 66166161073 in words is "sixty-six billion, one hundred sixty-six million, one hundred sixty-one thousand, seventy-three".