181647798946 has 4 divisors (see below), whose sum is σ = 272471698422. Its totient is φ = 90823899472.

The previous prime is 181647798919. The next prime is 181647798971. The reversal of 181647798946 is 649897746181.

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

It can be written as a sum of positive squares in only one way, i.e., 133087065721 + 48560733225 = 364811^2 + 220365^2 .

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 as a sum of consecutive naturals, namely, 45411949735 + ... + 45411949738.

Almost surely, 2^181647798946 is an apocalyptic number.

181647798946 is a deficient number, since it is larger than the sum of its proper divisors (90823899476).

181647798946 is an equidigital number, since it uses as much as digits as its factorization.

181647798946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90823899475.

The product of its digits is 146313216, while the sum is 70.

The spelling of 181647798946 in words is "one hundred eighty-one billion, six hundred forty-seven million, seven hundred ninety-eight thousand, nine hundred forty-six".