161670322181 has 4 divisors (see below), whose sum is σ = 163618157472. Its totient is φ = 159722486892.

The previous prime is 161670322153. The next prime is 161670322193. The reversal of 161670322181 is 181223076161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161670322181 - 2¹⁰ = 161670321157 is a prime.

It is a super-2 number, since 2×161670322181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161670322141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 973917521 + ... + 973917686.

It is an arithmetic number, because the mean of its divisors is an integer number (40904539368).

Almost surely, 2^161670322181 is an apocalyptic number.

It is an amenable number.

161670322181 is a deficient number, since it is larger than the sum of its proper divisors (1947835291).

161670322181 is an equidigital number, since it uses as much as digits as its factorization.

161670322181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947835290.

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 161670322181 in words is "one hundred sixty-one billion, six hundred seventy million, three hundred twenty-two thousand, one hundred eighty-one".