161803650838 has 16 divisors (see below), whose sum is σ = 258831069840. Its totient is φ = 75595101696.

The previous prime is 161803650829. The next prime is 161803650839. The reversal of 161803650838 is 838056308161.

It is a junction number, because it is equal to n+sod(n) for n = 161803650791 and 161803650800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161803650839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17113731 + ... + 17123182.

It is an arithmetic number, because the mean of its divisors is an integer number (16176941865).

Almost surely, 2^161803650838 is an apocalyptic number.

161803650838 is a deficient number, since it is larger than the sum of its proper divisors (97027419002).

161803650838 is a wasteful number, since it uses less digits than its factorization.

161803650838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34237071.

The product of its (nonzero) digits is 829440, while the sum is 49.

Adding to 161803650838 its reverse (838056308161), we get a palindrome (999859958999).

The spelling of 161803650838 in words is "one hundred sixty-one billion, eight hundred three million, six hundred fifty thousand, eight hundred thirty-eight".