161638382 has 8 divisors (see below), whose sum is σ = 242744376. Its totient is φ = 80723592.

The previous prime is 161638381. The next prime is 161638409. The reversal of 161638382 is 283836161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161638382² = 52253933071155848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161638381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45668 + ... + 49079.

It is an arithmetic number, because the mean of its divisors is an integer number (30343047).

Almost surely, 2^161638382 is an apocalyptic number.

161638382 is a deficient number, since it is larger than the sum of its proper divisors (81105994).

161638382 is an equidigital number, since it uses as much as digits as its factorization.

161638382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95602.

The product of its digits is 41472, while the sum is 38.

The square root of 161638382 is about 12713.7084283068. The cubic root of 161638382 is about 544.7302562121.

The spelling of 161638382 in words is "one hundred sixty-one million, six hundred thirty-eight thousand, three hundred eighty-two".