161218944 has 64 divisors (see below), whose sum is σ = 475830000. Its totient is φ = 53738496.

The previous prime is 161218943. The next prime is 161218969. The reversal of 161218944 is 449812161.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 161218899 and 161218908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161218943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19869 + ... + 26780.

Almost surely, 2^161218944 is an apocalyptic number.

It is an amenable number.

161218944 is an abundant number, since it is smaller than the sum of its proper divisors (314611056).

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

161218944 is an equidigital number, since it uses as much as digits as its factorization.

161218944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46672 (or 46654 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 161218944 is about 12697.2022115110. The cubic root of 161218944 is about 544.2586716766.

The spelling of 161218944 in words is "one hundred sixty-one million, two hundred eighteen thousand, nine hundred forty-four".