81958085918 has 8 divisors (see below), whose sum is σ = 122941709280. Its totient is φ = 40977516160.

The previous prime is 81958085899. The next prime is 81958085929.

81958085918 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695078 + ... + 804393.

It is an arithmetic number, because the mean of its divisors is an integer number (15367713660).

Almost surely, 2^81958085918 is an apocalyptic number.

81958085918 is a deficient number, since it is larger than the sum of its proper divisors (40983623362).

81958085918 is a wasteful number, since it uses less digits than its factorization.

81958085918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526802.

The product of its (nonzero) digits is 8294400, while the sum is 62.

The spelling of 81958085918 in words is "eighty-one billion, nine hundred fifty-eight million, eighty-five thousand, nine hundred eighteen".