161202166165 has 64 divisors (see below), whose sum is σ = 216334540800. Its totient is φ = 114811167744.

The previous prime is 161202166163. The next prime is 161202166193. The reversal of 161202166165 is 561661202161.

It is not a de Polignac number, because 161202166165 - 2¹ = 161202166163 is a prime.

It is a super-2 number, since 2×161202166165² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161202166163) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18539559 + ... + 18548251.

It is an arithmetic number, because the mean of its divisors is an integer number (3380227200).

Almost surely, 2^161202166165 is an apocalyptic number.

It is an amenable number.

161202166165 is a deficient number, since it is larger than the sum of its proper divisors (55132374635).

161202166165 is a wasteful number, since it uses less digits than its factorization.

161202166165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8926.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 161202166165 in words is "one hundred sixty-one billion, two hundred two million, one hundred sixty-six thousand, one hundred sixty-five".