161949316356 has 144 divisors (see below), whose sum is σ = 429486273216. Its totient is φ = 53357076864.

The previous prime is 161949316343. The next prime is 161949316363. The reversal of 161949316356 is 653613949161.

161949316356 is a `hidden beast` number, since 1 + 6 + 194 + 93 + 16 + 356 = 666.

161949316356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30060295 + ... + 30065681.

It is an arithmetic number, because the mean of its divisors is an integer number (2982543564).

Almost surely, 2^161949316356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161949316356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214743136608).

161949316356 is an abundant number, since it is smaller than the sum of its proper divisors (267536956860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161949316356 is a wasteful number, since it uses less digits than its factorization.

161949316356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5760 (or 5746 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 54.

The spelling of 161949316356 in words is "one hundred sixty-one billion, nine hundred forty-nine million, three hundred sixteen thousand, three hundred fifty-six".