81875333252 has 12 divisors (see below), whose sum is σ = 143423844060. Its totient is φ = 40897092096.

The previous prime is 81875333251. The next prime is 81875333321. The reversal of 81875333252 is 25233357818.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24804990016 + 57070343236 = 157496^2 + 238894^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81875333197 and 81875333206.

It is not an unprimeable number, because it can be changed into a prime (81875333251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10139093 + ... + 10147164.

It is an arithmetic number, because the mean of its divisors is an integer number (11951987005).

Almost surely, 2^81875333252 is an apocalyptic number.

It is an amenable number.

81875333252 is a deficient number, since it is larger than the sum of its proper divisors (61548510808).

81875333252 is a wasteful number, since it uses less digits than its factorization.

81875333252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20287270 (or 20287268 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 47.

The spelling of 81875333252 in words is "eighty-one billion, eight hundred seventy-five million, three hundred thirty-three thousand, two hundred fifty-two".