161316864 has 96 divisors (see below), whose sum is σ = 466871340. Its totient is φ = 53673984.

The previous prime is 161316863. The next prime is 161316907. The reversal of 161316864 is 468613161.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×161316864² = 52046261221588992, which contains 22 as substring.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (161316863) 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, 294639 + ... + 295185.

Almost surely, 2^161316864 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 161316864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233435670).

161316864 is an abundant number, since it is smaller than the sum of its proper divisors (305554476).

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

161316864 is an frugal number, since it uses more digits than its factorization.

161316864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 552 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 161316864 is about 12701.0575937597. The cubic root of 161316864 is about 544.3688386783.

The spelling of 161316864 in words is "one hundred sixty-one million, three hundred sixteen thousand, eight hundred sixty-four".