180381817836 has 384 divisors, whose sum is σ = 553638758400. Its totient is φ = 50213560320.

The previous prime is 180381817783. The next prime is 180381817843. The reversal of 180381817836 is 638718183081.

It is a happy number.

180381817836 is a `hidden beast` number, since 180 + 381 + 8 + 1 + 7 + 83 + 6 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 184627780 + ... + 184628756.

It is an arithmetic number, because the mean of its divisors is an integer number (1441767600).

Almost surely, 2^180381817836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 180381817836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276819379200).

180381817836 is an abundant number, since it is smaller than the sum of its proper divisors (373256940564).

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

180381817836 is a wasteful number, since it uses less digits than its factorization.

180381817836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286 (or 1278 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 180381817836 in words is "one hundred eighty billion, three hundred eighty-one million, eight hundred seventeen thousand, eight hundred thirty-six".