161316803109 has 16 divisors (see below), whose sum is σ = 268162997760. Its totient is φ = 83800936560.

The previous prime is 161316803101. The next prime is 161316803143. The reversal of 161316803109 is 901308613161.

It is a happy number.

It is not a de Polignac number, because 161316803109 - 2³ = 161316803101 is a prime.

It is a super-2 number, since 2×161316803109² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161316803101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349170339 + ... + 349170800.

It is an arithmetic number, because the mean of its divisors is an integer number (16760187360).

Almost surely, 2^161316803109 is an apocalyptic number.

It is an amenable number.

161316803109 is a deficient number, since it is larger than the sum of its proper divisors (106846194651).

161316803109 is a wasteful number, since it uses less digits than its factorization.

161316803109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698341160.

The product of its (nonzero) digits is 23328, while the sum is 39.

The spelling of 161316803109 in words is "one hundred sixty-one billion, three hundred sixteen million, eight hundred three thousand, one hundred nine".