161318256 has 80 divisors (see below), whose sum is σ = 458958720. Its totient is φ = 48418560.

The previous prime is 161318243. The next prime is 161318279. The reversal of 161318256 is 652813161.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56151 + ... + 58953.

It is an arithmetic number, because the mean of its divisors is an integer number (5736984).

Almost surely, 2^161318256 is an apocalyptic number.

161318256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161318256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229479360).

161318256 is an abundant number, since it is smaller than the sum of its proper divisors (297640464).

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

161318256 is a wasteful number, since it uses less digits than its factorization.

161318256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934 (or 2928 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 161318256 is about 12701.1123922277. The cubic root of 161318256 is about 544.3704044564.

The spelling of 161318256 in words is "one hundred sixty-one million, three hundred eighteen thousand, two hundred fifty-six".