81547334160 has 80 divisors (see below), whose sum is σ = 261513887040. Its totient is φ = 20996093440.

The previous prime is 81547334159. The next prime is 81547334179. The reversal of 81547334160 is 6143374518.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5851326 + ... + 5865245.

It is an arithmetic number, because the mean of its divisors is an integer number (3268923588).

Almost surely, 2^81547334160 is an apocalyptic number.

81547334160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81547334160 is an abundant number, since it is smaller than the sum of its proper divisors (179966552880).

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

81547334160 is a wasteful number, since it uses less digits than its factorization.

81547334160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11716616 (or 11716610 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 81547334160 in words is "eighty-one billion, five hundred forty-seven million, three hundred thirty-four thousand, one hundred sixty".