161605022 has 4 divisors (see below), whose sum is σ = 242407536. Its totient is φ = 80802510.

The previous prime is 161605019. The next prime is 161605027. The reversal of 161605022 is 220506161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 220506161 = 229 ⋅962909.

It is a super-2 number, since 2×161605022² = 52232366271240968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161605027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40401254 + ... + 40401257.

It is an arithmetic number, because the mean of its divisors is an integer number (60601884).

Almost surely, 2^161605022 is an apocalyptic number.

161605022 is a deficient number, since it is larger than the sum of its proper divisors (80802514).

161605022 is an equidigital number, since it uses as much as digits as its factorization.

161605022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80802513.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 161605022 is about 12712.3963909249. The cubic root of 161605022 is about 544.6927786208.

The spelling of 161605022 in words is "one hundred sixty-one million, six hundred five thousand, twenty-two".