161858814 has 32 divisors (see below), whose sum is σ = 349138944. Its totient is φ = 49728480.

The previous prime is 161858813. The next prime is 161858821. The reversal of 161858814 is 418858161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161858813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75619 + ... + 77729.

It is an arithmetic number, because the mean of its divisors is an integer number (10910592).

Almost surely, 2^161858814 is an apocalyptic number.

161858814 is an abundant number, since it is smaller than the sum of its proper divisors (187280130).

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

161858814 is a wasteful number, since it uses less digits than its factorization.

161858814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112.

The product of its digits is 61440, while the sum is 42.

The square root of 161858814 is about 12722.3745425137. The cubic root of 161858814 is about 544.9777663965.

The spelling of 161858814 in words is "one hundred sixty-one million, eight hundred fifty-eight thousand, eight hundred fourteen".