161829117868 has 12 divisors (see below), whose sum is σ = 308946497832. Its totient is φ = 73558689920.

The previous prime is 161829117811. The next prime is 161829117883. The reversal of 161829117868 is 868711928161.

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, 1838967205 + ... + 1838967292.

It is an arithmetic number, because the mean of its divisors is an integer number (25745541486).

Almost surely, 2^161829117868 is an apocalyptic number.

It is an amenable number.

161829117868 is a deficient number, since it is larger than the sum of its proper divisors (147117379964).

161829117868 is a wasteful number, since it uses less digits than its factorization.

161829117868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677934512 (or 3677934510 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 58.

The spelling of 161829117868 in words is "one hundred sixty-one billion, eight hundred twenty-nine million, one hundred seventeen thousand, eight hundred sixty-eight".