81134686688 has 48 divisors (see below), whose sum is σ = 174279769776. Its totient is φ = 36874199040.

The previous prime is 81134686687. The next prime is 81134686733. The reversal of 81134686688 is 88668643118.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81134686687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3661370 + ... + 3683462.

It is an arithmetic number, because the mean of its divisors is an integer number (3630828537).

Almost surely, 2^81134686688 is an apocalyptic number.

81134686688 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81134686688 is an abundant number, since it is smaller than the sum of its proper divisors (93145083088).

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

81134686688 is a wasteful number, since it uses less digits than its factorization.

81134686688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32547 (or 32539 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 59.

The spelling of 81134686688 in words is "eighty-one billion, one hundred thirty-four million, six hundred eighty-six thousand, six hundred eighty-eight".