81986414356 has 24 divisors (see below), whose sum is σ = 178879450176. Its totient is φ = 31942758720.

The previous prime is 81986414339. The next prime is 81986414381. The reversal of 81986414356 is 65341468918.

It is a junction number, because it is equal to n+sod(n) for n = 81986414297 and 81986414306.

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 7 ways as a sum of consecutive naturals, for example, 133094521 + ... + 133095136.

It is an arithmetic number, because the mean of its divisors is an integer number (7453310424).

Almost surely, 2^81986414356 is an apocalyptic number.

It is an amenable number.

81986414356 is an abundant number, since it is smaller than the sum of its proper divisors (96893035820).

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

81986414356 is a wasteful number, since it uses less digits than its factorization.

81986414356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266189679 (or 266189677 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 55.

The spelling of 81986414356 in words is "eighty-one billion, nine hundred eighty-six million, four hundred fourteen thousand, three hundred fifty-six".