81546234620 has 24 divisors (see below), whose sum is σ = 171268105344. Its totient is φ = 32614491456.

The previous prime is 81546234617. The next prime is 81546234739. The reversal of 81546234620 is 2643264518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80267 + ... + 411746.

It is an arithmetic number, because the mean of its divisors is an integer number (7136171056).

Almost surely, 2^81546234620 is an apocalyptic number.

It is an amenable number.

81546234620 is an abundant number, since it is smaller than the sum of its proper divisors (89721870724).

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

81546234620 is a wasteful number, since it uses less digits than its factorization.

81546234620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500309 (or 500307 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 81546234620 in words is "eighty-one billion, five hundred forty-six million, two hundred thirty-four thousand, six hundred twenty".