161538017876 has 12 divisors (see below), whose sum is σ = 285285032340. Its totient is φ = 80028008640.

The previous prime is 161538017843. The next prime is 161538017881. The reversal of 161538017876 is 678710835161.

It can be written as a sum of positive squares in 2 ways, for example, as 139781767876 + 21756250000 = 373874^2 + 147500^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185249585 + ... + 185250456.

It is an arithmetic number, because the mean of its divisors is an integer number (23773752695).

Almost surely, 2^161538017876 is an apocalyptic number.

It is an amenable number.

161538017876 is a deficient number, since it is larger than the sum of its proper divisors (123747014464).

161538017876 is a wasteful number, since it uses less digits than its factorization.

161538017876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370500154 (or 370500152 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 53.

The spelling of 161538017876 in words is "one hundred sixty-one billion, five hundred thirty-eight million, seventeen thousand, eight hundred seventy-six".