161330653836 has 288 divisors, whose sum is σ = 482650721280. Its totient is φ = 44909337600.

The previous prime is 161330653831. The next prime is 161330653867. The reversal of 161330653836 is 638356033161.

It is a junction number, because it is equal to n+sod(n) for n = 161330653791 and 161330653800.

It is not an unprimeable number, because it can be changed into a prime (161330653831) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 53366221 + ... + 53369243.

It is an arithmetic number, because the mean of its divisors is an integer number (1675870560).

Almost surely, 2^161330653836 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 161330653836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241325360640).

161330653836 is an abundant number, since it is smaller than the sum of its proper divisors (321320067444).

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

161330653836 is a wasteful number, since it uses less digits than its factorization.

161330653836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3277 (or 3272 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

Adding to 161330653836 its reverse (638356033161), we get a palindrome (799686686997).

The spelling of 161330653836 in words is "one hundred sixty-one billion, three hundred thirty million, six hundred fifty-three thousand, eight hundred thirty-six".