161648442 has 12 divisors (see below), whose sum is σ = 350238330. Its totient is φ = 53882808.

The previous prime is 161648441. The next prime is 161648467. The reversal of 161648442 is 244846161.

It is a happy number.

161648442 is a `hidden beast` number, since 1 + 6 + 1 + 648 + 4 + 4 + 2 = 666.

161648442 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 105083001 + 56565441 = 10251^2 + 7521^2 .

It is a super-2 number, since 2×161648442² = 52260437602054728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161648397 and 161648406.

It is not an unprimeable number, because it can be changed into a prime (161648441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4490217 + ... + 4490252.

Almost surely, 2^161648442 is an apocalyptic number.

161648442 is an abundant number, since it is smaller than the sum of its proper divisors (188589888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161648442 is a wasteful number, since it uses less digits than its factorization.

161648442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8980477 (or 8980474 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 161648442 is about 12714.1040580923. The cubic root of 161648442 is about 544.7415568959.

The spelling of 161648442 in words is "one hundred sixty-one million, six hundred forty-eight thousand, four hundred forty-two".