161605330444 has 6 divisors (see below), whose sum is σ = 282809328284. Its totient is φ = 80802665220.

The previous prime is 161605330441. The next prime is 161605330451. The reversal of 161605330444 is 444033506161.

It is a super-2 number, since 2×161605330444² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161605330441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20200666302 + ... + 20200666309.

Almost surely, 2^161605330444 is an apocalyptic number.

It is an amenable number.

161605330444 is a deficient number, since it is larger than the sum of its proper divisors (121203997840).

161605330444 is a wasteful number, since it uses less digits than its factorization.

161605330444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40401332615 (or 40401332613 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 161605330444 in words is "one hundred sixty-one billion, six hundred five million, three hundred thirty thousand, four hundred forty-four".