181520770740 has 96 divisors (see below), whose sum is σ = 521606781696. Its totient is φ = 47149655040.

The previous prime is 181520770727. The next prime is 181520770771. The reversal of 181520770740 is 47077025181.

181520770740 is digitally balanced in base 2, 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 = 181520770692 and 181520770701.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136224 + ... + 617736.

It is an arithmetic number, because the mean of its divisors is an integer number (5433403976).

Almost surely, 2^181520770740 is an apocalyptic number.

181520770740 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 181520770740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260803390848).

181520770740 is an abundant number, since it is smaller than the sum of its proper divisors (340086010956).

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

181520770740 is a wasteful number, since it uses less digits than its factorization.

181520770740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481689 (or 481687 counting only the distinct ones).

The product of its (nonzero) digits is 109760, while the sum is 42.

The spelling of 181520770740 in words is "one hundred eighty-one billion, five hundred twenty million, seven hundred seventy thousand, seven hundred forty".