161662118 has 4 divisors (see below), whose sum is σ = 242493180. Its totient is φ = 80831058.

The previous prime is 161662087. The next prime is 161662159. The reversal of 161662118 is 811266161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 811266161 = 19 ⋅42698219.

It is a super-2 number, since 2×161662118² = 52269280792491848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40415528 + ... + 40415531.

It is an arithmetic number, because the mean of its divisors is an integer number (60623295).

Almost surely, 2^161662118 is an apocalyptic number.

161662118 is a deficient number, since it is larger than the sum of its proper divisors (80831062).

161662118 is an equidigital number, since it uses as much as digits as its factorization.

161662118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80831061.

The product of its digits is 3456, while the sum is 32.

The square root of 161662118 is about 12714.6418746263. The cubic root of 161662118 is about 544.7569187832.

The spelling of 161662118 in words is "one hundred sixty-one million, six hundred sixty-two thousand, one hundred eighteen".