181456043640 has 256 divisors, whose sum is σ = 587474363520. Its totient is φ = 44670320640.

The previous prime is 181456043633. The next prime is 181456043641. The reversal of 181456043640 is 46340654181.

181456043640 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 181456043592 and 181456043601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181456043641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 49400844 + ... + 49404516.

Almost surely, 2^181456043640 is an apocalyptic number.

181456043640 is a gapful number since it is divisible by the number (10) 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 181456043640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293737181760).

181456043640 is an abundant number, since it is smaller than the sum of its proper divisors (406018319880).

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

181456043640 is a wasteful number, since it uses less digits than its factorization.

181456043640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162 (or 4158 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 181456043640 in words is "one hundred eighty-one billion, four hundred fifty-six million, forty-three thousand, six hundred forty".