161645222 has 8 divisors (see below), whose sum is σ = 250289472. Its totient is φ = 78215400.

The previous prime is 161645189. The next prime is 161645227. The reversal of 161645222 is 222546161.

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

It is a super-2 number, since 2×161645222² = 52258355590858568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161645227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1303529 + ... + 1303652.

It is an arithmetic number, because the mean of its divisors is an integer number (31286184).

Almost surely, 2^161645222 is an apocalyptic number.

161645222 is a deficient number, since it is larger than the sum of its proper divisors (88644250).

161645222 is a wasteful number, since it uses less digits than its factorization.

161645222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2607214.

The product of its digits is 5760, while the sum is 29.

The square root of 161645222 is about 12713.9774264390. The cubic root of 161645222 is about 544.7379398294.

The spelling of 161645222 in words is "one hundred sixty-one million, six hundred forty-five thousand, two hundred twenty-two".