81325760052 has 24 divisors (see below), whose sum is σ = 189878677632. Its totient is φ = 27091648000.

The previous prime is 81325759997. The next prime is 81325760069. The reversal of 81325760052 is 25006752318.

It is a super-2 number, since 2×81325760052² (a number of 23 digits) contains 22 as substring.

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, 2097324 + ... + 2135747.

It is an arithmetic number, because the mean of its divisors is an integer number (7911611568).

Almost surely, 2^81325760052 is an apocalyptic number.

It is an amenable number.

81325760052 is an abundant number, since it is smaller than the sum of its proper divisors (108552917580).

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

81325760052 is a wasteful number, since it uses less digits than its factorization.

81325760052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4234679 (or 4234677 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 81325760052 in words is "eighty-one billion, three hundred twenty-five million, seven hundred sixty thousand, fifty-two".