181313197420840 has 32 divisors (see below), whose sum is σ = 407955356399880. Its totient is φ = 72525161243392.

The previous prime is 181313197420717. The next prime is 181313197420867. The reversal of 181313197420840 is 48024791313181.

181313197420840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 37719422524996 + 143593774895844 = 6141614^2 + 11983062^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23806542 + ... + 30485698.

Almost surely, 2^{181313197420840} is an apocalyptic number.

181313197420840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181313197420840 is an abundant number, since it is smaller than the sum of its proper divisors (226642158979040).

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

181313197420840 is a wasteful number, since it uses less digits than its factorization.

181313197420840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7357821 (or 7357817 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 181313197420840 in words is "one hundred eighty-one trillion, three hundred thirteen billion, one hundred ninety-seven million, four hundred twenty thousand, eight hundred forty".