161858358 has 64 divisors (see below), whose sum is σ = 370137600. Its totient is φ = 52408800.

The previous prime is 161858341. The next prime is 161858363. The reversal of 161858358 is 853858161.

161858358 is a `hidden beast` number, since 1 + 6 + 18 + 583 + 58 = 666.

161858358 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 321535 + ... + 322037.

It is an arithmetic number, because the mean of its divisors is an integer number (5783400).

Almost surely, 2^161858358 is an apocalyptic number.

161858358 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 161858358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185068800).

161858358 is an abundant number, since it is smaller than the sum of its proper divisors (208279242).

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

161858358 is a wasteful number, since it uses less digits than its factorization.

161858358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 668 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The square root of 161858358 is about 12722.3566213182. The cubic root of 161858358 is about 544.9772546128.

The spelling of 161858358 in words is "one hundred sixty-one million, eight hundred fifty-eight thousand, three hundred fifty-eight".