161813358 has 96 divisors (see below), whose sum is σ = 418991040. Its totient is φ = 44167680.

The previous prime is 161813357. The next prime is 161813369. The reversal of 161813358 is 853318161.

161813358 is a `hidden beast` number, since 1 + 618 + 1 + 3 + 35 + 8 = 666.

161813358 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161813357) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 284098 + ... + 284666.

It is an arithmetic number, because the mean of its divisors is an integer number (4364490).

Almost surely, 2^161813358 is an apocalyptic number.

161813358 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161813358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209495520).

161813358 is an abundant number, since it is smaller than the sum of its proper divisors (257177682).

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

161813358 is a wasteful number, since it uses less digits than its factorization.

161813358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 679 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 161813358 is about 12720.5879581095. The cubic root of 161813358 is about 544.9267449165.

The spelling of 161813358 in words is "one hundred sixty-one million, eight hundred thirteen thousand, three hundred fifty-eight".