181800001860 has 96 divisors (see below), whose sum is σ = 521087952000. Its totient is φ = 47333486592.

The previous prime is 181800001847. The next prime is 181800001879. The reversal of 181800001860 is 68100008181.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7079604 + ... + 7105236.

It is an arithmetic number, because the mean of its divisors is an integer number (5427999500).

Almost surely, 2^181800001860 is an apocalyptic number.

181800001860 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 181800001860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260543976000).

181800001860 is an abundant number, since it is smaller than the sum of its proper divisors (339287950140).

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

181800001860 is a wasteful number, since it uses less digits than its factorization.

181800001860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28437 (or 28435 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 33.

The spelling of 181800001860 in words is "one hundred eighty-one billion, eight hundred million, one thousand, eight hundred sixty".