181312701328 has 80 divisors (see below), whose sum is σ = 394039779840. Its totient is φ = 80104985600.

The previous prime is 181312701319. The next prime is 181312701337. The reversal of 181312701328 is 823107213181.

It is an interprime number because it is at equal distance from previous prime (181312701319) and next prime (181312701337).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1894401 + ... + 1987807.

It is an arithmetic number, because the mean of its divisors is an integer number (4925497248).

Almost surely, 2^181312701328 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 181312701328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197019889920).

181312701328 is an abundant number, since it is smaller than the sum of its proper divisors (212727078512).

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

181312701328 is a wasteful number, since it uses less digits than its factorization.

181312701328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93736 (or 93730 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 181312701328 in words is "one hundred eighty-one billion, three hundred twelve million, seven hundred one thousand, three hundred twenty-eight".