181172748540 has 192 divisors, whose sum is σ = 589563878400. Its totient is φ = 40715372544.

The previous prime is 181172748511. The next prime is 181172748571. The reversal of 181172748540 is 45847271181.

It is a self number, because there is not a number n which added to its sum of digits gives 181172748540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6677482 + ... + 6704558.

It is an arithmetic number, because the mean of its divisors is an integer number (3070645200).

Almost surely, 2^181172748540 is an apocalyptic number.

181172748540 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 181172748540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294781939200).

181172748540 is an abundant number, since it is smaller than the sum of its proper divisors (408391129860).

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

181172748540 is a wasteful number, since it uses less digits than its factorization.

181172748540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27364 (or 27362 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 48.

The spelling of 181172748540 in words is "one hundred eighty-one billion, one hundred seventy-two million, seven hundred forty-eight thousand, five hundred forty".