18581996158 has 32 divisors (see below), whose sum is σ = 30656102400. Its totient is φ = 8377404000.

The previous prime is 18581996141. The next prime is 18581996177. The reversal of 18581996158 is 85169918581.

It is a junction number, because it is equal to n+sod(n) for n = 18581996096 and 18581996105.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 1460163 + ... + 1472833.

It is an arithmetic number, because the mean of its divisors is an integer number (958003200).

Almost surely, 2^18581996158 is an apocalyptic number.

18581996158 is a deficient number, since it is larger than the sum of its proper divisors (12074106242).

18581996158 is a wasteful number, since it uses less digits than its factorization.

18581996158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13224.

The product of its digits is 6220800, while the sum is 61.

The spelling of 18581996158 in words is "eighteen billion, five hundred eighty-one million, nine hundred ninety-six thousand, one hundred fifty-eight".