161216704 has 56 divisors (see below), whose sum is σ = 353891088. Its totient is φ = 72253440.

The previous prime is 161216701. The next prime is 161216707. The reversal of 161216704 is 407612161.

161216704 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161216701) and next prime (161216707).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (161216701) 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, 49824 + ... + 52960.

Almost surely, 2^161216704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161216704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176945544).

161216704 is an abundant number, since it is smaller than the sum of its proper divisors (192674384).

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

161216704 is a wasteful number, since it uses less digits than its factorization.

161216704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233 (or 3223 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 161216704 is about 12697.1140027961. The cubic root of 161216704 is about 544.2561509946.

Adding to 161216704 its reverse (407612161), we get a palindrome (568828865).

The spelling of 161216704 in words is "one hundred sixty-one million, two hundred sixteen thousand, seven hundred four".