81250081936 has 15 divisors (see below), whose sum is σ = 157424242873. Its totient is φ = 40624470880.

The previous prime is 81250081901. The next prime is 81250081961. The reversal of 81250081936 is 63918005218.

The square root of 81250081936 is 285044.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 38085864336 + 43164217600 = 195156^2 + 207760^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81250081892 and 81250081901.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1104546 + ... + 1175806.

Almost surely, 2^81250081936 is an apocalyptic number.

81250081936 is the 285044-th square number.

It is an amenable number.

81250081936 is a deficient number, since it is larger than the sum of its proper divisors (76174160937).

81250081936 is an frugal number, since it uses more digits than its factorization.

81250081936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142530 (or 71263 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 81250081936 in words is "eighty-one billion, two hundred fifty million, eighty-one thousand, nine hundred thirty-six".