81725252575484 has 48 divisors (see below), whose sum is σ = 171801991001088. Its totient is φ = 33257735246208.

The previous prime is 81725252575453. The next prime is 81725252575517. The reversal of 81725252575484 is 48457525252718.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81725252575484.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 463059824 + ... + 463236279.

It is an arithmetic number, because the mean of its divisors is an integer number (3579208145856).

Almost surely, 2^{81725252575484} is an apocalyptic number.

It is an amenable number.

81725252575484 is an abundant number, since it is smaller than the sum of its proper divisors (90076738425604).

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

81725252575484 is a wasteful number, since it uses less digits than its factorization.

81725252575484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926296274 (or 926296272 counting only the distinct ones).

The product of its digits is 250880000, while the sum is 65.

The spelling of 81725252575484 in words is "eighty-one trillion, seven hundred twenty-five billion, two hundred fifty-two million, five hundred seventy-five thousand, four hundred eighty-four".