165561235233166 has 16 divisors (see below), whose sum is σ = 254399396968080. Its totient is φ = 80761443001920.

The previous prime is 165561235233161. The next prime is 165561235233167. The reversal of 165561235233166 is 661332532165561.

It is a super-2 number, since 2×165561235233166² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165561235233161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62289820 + ... + 64893328.

It is an arithmetic number, because the mean of its divisors is an integer number (15899962310505).

Almost surely, 2^{165561235233166} is an apocalyptic number.

165561235233166 is a deficient number, since it is larger than the sum of its proper divisors (88838161734914).

165561235233166 is a wasteful number, since it uses less digits than its factorization.

165561235233166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3379059.

The product of its digits is 17496000, while the sum is 55.

The spelling of 165561235233166 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, two hundred thirty-five million, two hundred thirty-three thousand, one hundred sixty-six".