161500566597172 has 12 divisors (see below), whose sum is σ = 308319263503776. Its totient is φ = 73409348453240.

The previous prime is 161500566597067. The next prime is 161500566597191. The reversal of 161500566597172 is 271795665005161.

161500566597172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161500566597172² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161500566597172.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1835233711288 + ... + 1835233711375.

It is an arithmetic number, because the mean of its divisors is an integer number (25693271958648).

Almost surely, 2^{161500566597172} is an apocalyptic number.

It is an amenable number.

161500566597172 is a deficient number, since it is larger than the sum of its proper divisors (146818696906604).

161500566597172 is a wasteful number, since it uses less digits than its factorization.

161500566597172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3670467422678 (or 3670467422676 counting only the distinct ones).

The product of its (nonzero) digits is 23814000, while the sum is 61.

The spelling of 161500566597172 in words is "one hundred sixty-one trillion, five hundred billion, five hundred sixty-six million, five hundred ninety-seven thousand, one hundred seventy-two".