181713226380 has 768 divisors, whose sum is σ = 667621785600. Its totient is φ = 35966177280.

The previous prime is 181713226339. The next prime is 181713226381. The reversal of 181713226380 is 83622317181.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (181713226381) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 620181514 + ... + 620181806.

It is an arithmetic number, because the mean of its divisors is an integer number (869299200).

Almost surely, 2^181713226380 is an apocalyptic number.

181713226380 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 181713226380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333810892800).

181713226380 is an abundant number, since it is smaller than the sum of its proper divisors (485908559220).

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

181713226380 is a wasteful number, since it uses less digits than its factorization.

181713226380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 181713226380 in words is "one hundred eighty-one billion, seven hundred thirteen million, two hundred twenty-six thousand, three hundred eighty".