181875406646 has 4 divisors (see below), whose sum is σ = 272813109972. Its totient is φ = 90937703322.

The previous prime is 181875406639. The next prime is 181875406651. The reversal of 181875406646 is 646604578181.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 181875406591 and 181875406600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45468851660 + ... + 45468851663.

It is an arithmetic number, because the mean of its divisors is an integer number (68203277493).

Almost surely, 2^181875406646 is an apocalyptic number.

181875406646 is a deficient number, since it is larger than the sum of its proper divisors (90937703326).

181875406646 is an equidigital number, since it uses as much as digits as its factorization.

181875406646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90937703325.

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 181875406646 in words is "one hundred eighty-one billion, eight hundred seventy-five million, four hundred six thousand, six hundred forty-six".