81875200625 has 10 divisors (see below), whose sum is σ = 102311251482. Its totient is φ = 65500160000.

The previous prime is 81875200597. The next prime is 81875200679. The reversal of 81875200625 is 52600257818.

It can be written as a sum of positive squares in 5 ways, for example, as 17487153121 + 64388047504 = 132239^2 + 253748^2 .

It is not a de Polignac number, because 81875200625 - 2²⁸ = 81606765169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 65499536 + ... + 65500785.

Almost surely, 2^81875200625 is an apocalyptic number.

It is an amenable number.

81875200625 is a deficient number, since it is larger than the sum of its proper divisors (20436050857).

81875200625 is an equidigital number, since it uses as much as digits as its factorization.

81875200625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131000341 (or 131000326 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 44.

The spelling of 81875200625 in words is "eighty-one billion, eight hundred seventy-five million, two hundred thousand, six hundred twenty-five".