181346433772 has 48 divisors (see below), whose sum is σ = 371301145600. Its totient is φ = 77466560976.

The previous prime is 181346433739. The next prime is 181346433809. The reversal of 181346433772 is 277334643181.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205933 + ... + 636475.

Almost surely, 2^181346433772 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 181346433772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185650572800).

181346433772 is an abundant number, since it is smaller than the sum of its proper divisors (189954711828).

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

181346433772 is a wasteful number, since it uses less digits than its factorization.

181346433772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430875 (or 430859 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 49.

The spelling of 181346433772 in words is "one hundred eighty-one billion, three hundred forty-six million, four hundred thirty-three thousand, seven hundred seventy-two".