161500566597173 has 6 divisors (see below), whose sum is σ = 166878316994742. Its totient is φ = 156290870899560.

The previous prime is 161500566597067. The next prime is 161500566597191. The reversal of 161500566597173 is 371795665005161.

It can be written as a sum of positive squares in only one way, i.e., 146785655253169 + 14714911344004 = 12115513^2 + 3836002^2 .

It is not a de Polignac number, because 161500566597173 - 2²⁸ = 161500298161717 is a prime.

It is a super-2 number, since 2×161500566597173² (a number of 29 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 (161500569597173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84027348986 + ... + 84027350907.

It is an arithmetic number, because the mean of its divisors is an integer number (27813052832457).

Almost surely, 2^{161500566597173} is an apocalyptic number.

It is an amenable number.

161500566597173 is a deficient number, since it is larger than the sum of its proper divisors (5377750397569).

161500566597173 is an equidigital number, since it uses as much as digits as its factorization.

161500566597173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168054699955 (or 168054699924 counting only the distinct ones).

The product of its (nonzero) digits is 35721000, while the sum is 62.

The spelling of 161500566597173 in words is "one hundred sixty-one trillion, five hundred billion, five hundred sixty-six million, five hundred ninety-seven thousand, one hundred seventy-three".