181000563998 has 16 divisors (see below), whose sum is σ = 271974002400. Its totient is φ = 90342700800.

The previous prime is 181000563923. The next prime is 181000564037. The reversal of 181000563998 is 899365000181.

It is a happy number.

181000563998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×181000563998² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2690678 + ... + 2757126.

It is an arithmetic number, because the mean of its divisors is an integer number (16998375150).

Almost surely, 2^181000563998 is an apocalyptic number.

181000563998 is a deficient number, since it is larger than the sum of its proper divisors (90973438402).

181000563998 is a wasteful number, since it uses less digits than its factorization.

181000563998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68803.

The product of its (nonzero) digits is 466560, while the sum is 50.

The spelling of 181000563998 in words is "one hundred eighty-one billion, five hundred sixty-three thousand, nine hundred ninety-eight".