161235005165 has 24 divisors (see below), whose sum is σ = 209669442048.
Its totient is φ = 118975296960.
The previous prime is 161235005137. The next prime is 161235005171. The reversal of 161235005165 is 561500532161.
It is not a de Polignac number, because 161235005165 - 212 = 161235001069 is a prime.
It is a Duffinian number.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1049420 + ... + 1193210.
It is an arithmetic number, because the mean of its divisors is an integer number (8736226752).
Almost surely, 2161235005165 is an apocalyptic number.
It is an amenable number.
161235005165 is a deficient number, since it is larger than the sum of its proper divisors (48434436883).
161235005165 is a wasteful number, since it uses less digits than its factorization.
161235005165 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 145149 (or 145136 counting only the distinct ones).
The product of its (nonzero) digits is 27000, while the sum is 35.
The spelling of 161235005165 in words is "one hundred sixty-one billion, two hundred thirty-five million, five thousand, one hundred sixty-five".