81528304133025 has 36 divisors (see below), whose sum is σ = 146026988460288. Its totient is φ = 43481542733280.

The previous prime is 81528304132861. The next prime is 81528304133039. The reversal of 81528304133025 is 52033140382518.

81528304133025 is a `hidden beast` number, since 8 + 1 + 5 + 2 + 8 + 304 + 1 + 330 + 2 + 5 = 666.

It is not a de Polignac number, because 81528304133025 - 2³⁸ = 81253426226081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 50062744 + ... + 51665606.

It is an arithmetic number, because the mean of its divisors is an integer number (4056305235008).

Almost surely, 2^{81528304133025} is an apocalyptic number.

It is an amenable number.

81528304133025 is a deficient number, since it is larger than the sum of its proper divisors (64498684327263).

81528304133025 is a wasteful number, since it uses less digits than its factorization.

81528304133025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828942 (or 1828934 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 81528304133025 in words is "eighty-one trillion, five hundred twenty-eight billion, three hundred four million, one hundred thirty-three thousand, twenty-five".