181611820016 has 40 divisors (see below), whose sum is σ = 394235991984. Its totient is φ = 80319720960.

The previous prime is 181611820009. The next prime is 181611820043. The reversal of 181611820016 is 610028116181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13937885 + ... + 13950908.

Almost surely, 2^181611820016 is an apocalyptic number.

181611820016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

181611820016 is an abundant number, since it is smaller than the sum of its proper divisors (212624171968).

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

181611820016 is a wasteful number, since it uses less digits than its factorization.

181611820016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27888849 (or 27888843 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

Adding to 181611820016 its reverse (610028116181), we get a palindrome (791639936197).

The spelling of 181611820016 in words is "one hundred eighty-one billion, six hundred eleven million, eight hundred twenty thousand, sixteen".