81132886558 has 4 divisors (see below), whose sum is σ = 121699329840. Its totient is φ = 40566443278.

The previous prime is 81132886553. The next prime is 81132886609. The reversal of 81132886558 is 85568823118.

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

It is a junction number, because it is equal to n+sod(n) for n = 81132886499 and 81132886508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81132886553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20283221638 + ... + 20283221641.

It is an arithmetic number, because the mean of its divisors is an integer number (30424832460).

Almost surely, 2^81132886558 is an apocalyptic number.

81132886558 is a deficient number, since it is larger than the sum of its proper divisors (40566443282).

81132886558 is a wasteful number, since it uses less digits than its factorization.

81132886558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40566443281.

The product of its digits is 3686400, while the sum is 55.

The spelling of 81132886558 in words is "eighty-one billion, one hundred thirty-two million, eight hundred eighty-six thousand, five hundred fifty-eight".