181064242166 has 4 divisors (see below), whose sum is σ = 271596363252. Its totient is φ = 90532121082.

The previous prime is 181064242159. The next prime is 181064242171. The reversal of 181064242166 is 661242460181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 661242460181 = 1973 ⋅335145697.

It is a super-2 number, since 2×181064242166² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45266060540 + ... + 45266060543.

It is an arithmetic number, because the mean of its divisors is an integer number (67899090813).

Almost surely, 2^181064242166 is an apocalyptic number.

181064242166 is a deficient number, since it is larger than the sum of its proper divisors (90532121086).

181064242166 is an equidigital number, since it uses as much as digits as its factorization.

181064242166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90532121085.

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 181064242166 in words is "one hundred eighty-one billion, sixty-four million, two hundred forty-two thousand, one hundred sixty-six".