161318508 has 96 divisors (see below), whose sum is σ = 436907520. Its totient is φ = 45880320.

The previous prime is 161318501. The next prime is 161318519. The reversal of 161318508 is 805813161.

161318508 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161318508² = 52047322046692128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161318501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155953 + ... + 156983.

It is an arithmetic number, because the mean of its divisors is an integer number (4551120).

Almost surely, 2^161318508 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 161318508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218453760).

161318508 is an abundant number, since it is smaller than the sum of its proper divisors (275589012).

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

161318508 is a wasteful number, since it uses less digits than its factorization.

161318508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127 (or 1125 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 161318508 is about 12701.1223126147. The cubic root of 161318508 is about 544.3706879153.

The spelling of 161318508 in words is "one hundred sixty-one million, three hundred eighteen thousand, five hundred eight".