161858995230 has 128 divisors (see below), whose sum is σ = 398920743936. Its totient is φ = 42018739200.

The previous prime is 161858995229. The next prime is 161858995279. The reversal of 161858995230 is 32599858161.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 72875520 + ... + 72877740.

It is an arithmetic number, because the mean of its divisors is an integer number (3116568312).

Almost surely, 2^161858995230 is an apocalyptic number.

161858995230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161858995230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199460371968).

161858995230 is an abundant number, since it is smaller than the sum of its proper divisors (237061748706).

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

161858995230 is a wasteful number, since it uses less digits than its factorization.

161858995230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722.

The product of its (nonzero) digits is 4665600, while the sum is 57.

The spelling of 161858995230 in words is "one hundred sixty-one billion, eight hundred fifty-eight million, nine hundred ninety-five thousand, two hundred thirty".