81341286516 has 36 divisors (see below), whose sum is σ = 234985939552. Its totient is φ = 23240367504.

The previous prime is 81341286511. The next prime is 81341286553. The reversal of 81341286516 is 61568214318.

81341286516 is a `hidden beast` number, since 8 + 1 + 3 + 4 + 128 + 6 + 516 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81341286511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161391190 + ... + 161391693.

Almost surely, 2^81341286516 is an apocalyptic number.

It is an amenable number.

81341286516 is an abundant number, since it is smaller than the sum of its proper divisors (153644653036).

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

81341286516 is a wasteful number, since it uses less digits than its factorization.

81341286516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322782900 (or 322782895 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 81341286516 in words is "eighty-one billion, three hundred forty-one million, two hundred eighty-six thousand, five hundred sixteen".