161822642 has 8 divisors (see below), whose sum is σ = 244363500. Its totient is φ = 80368144.

The previous prime is 161822611. The next prime is 161822653. The reversal of 161822642 is 246228161.

It can be written as a sum of positive squares in 2 ways, for example, as 132457081 + 29365561 = 11509^2 + 5419^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 161822599 and 161822608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271217 + ... + 271812.

Almost surely, 2^161822642 is an apocalyptic number.

161822642 is a deficient number, since it is larger than the sum of its proper divisors (82540858).

161822642 is a wasteful number, since it uses less digits than its factorization.

161822642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543180.

The product of its digits is 9216, while the sum is 32.

The square root of 161822642 is about 12720.9528731145. The cubic root of 161822642 is about 544.9371663947.

The spelling of 161822642 in words is "one hundred sixty-one million, eight hundred twenty-two thousand, six hundred forty-two".