161022644 has 24 divisors (see below), whose sum is σ = 297548160. Its totient is φ = 76035456.

The previous prime is 161022643. The next prime is 161022671. The reversal of 161022644 is 446220161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161022643) 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 7 ways as a sum of consecutive naturals, for example, 22469 + ... + 28755.

It is an arithmetic number, because the mean of its divisors is an integer number (12397840).

Almost surely, 2^161022644 is an apocalyptic number.

It is an amenable number.

161022644 is a deficient number, since it is larger than the sum of its proper divisors (136525516).

161022644 is a wasteful number, since it uses less digits than its factorization.

161022644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6647 (or 6645 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 161022644 is about 12689.4698076791. The cubic root of 161022644 is about 544.0376857183.

The spelling of 161022644 in words is "one hundred sixty-one million, twenty-two thousand, six hundred forty-four".