81250200500 has 96 divisors (see below), whose sum is σ = 206125640448. Its totient is φ = 27400464000.

The previous prime is 81250200481. The next prime is 81250200511. The reversal of 81250200500 is 500205218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23219 + ... + 403781.

It is an arithmetic number, because the mean of its divisors is an integer number (2147142088).

Almost surely, 2^81250200500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81250200500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103062820224).

81250200500 is an abundant number, since it is smaller than the sum of its proper divisors (124875439948).

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

81250200500 is a wasteful number, since it uses less digits than its factorization.

81250200500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380650 (or 380638 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 81250200500 its reverse (500205218), we get a palindrome (81750405718).

The spelling of 81250200500 in words is "eighty-one billion, two hundred fifty million, two hundred thousand, five hundred".