81647524953604 has 9 divisors (see below), whose sum is σ = 142883200294471. Its totient is φ = 40823753440900.

The previous prime is 81647524953583. The next prime is 81647524953611. The reversal of 81647524953604 is 40635942574618.

The square root of 81647524953604 is 9035902.

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

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 15812829 + ... + 20330779.

It is a 2-persistent number, because it is pandigital, and so is 2⋅81647524953604 = 163295049907208, but 3⋅81647524953604 = 244942574860812 is not.

Almost surely, 2^{81647524953604} is an apocalyptic number.

81647524953604 is the 9035902-nd square number.

It is an amenable number.

81647524953604 is a deficient number, since it is larger than the sum of its proper divisors (61235675340867).

81647524953604 is an frugal number, since it uses more digits than its factorization.

81647524953604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9035906 (or 4517953 counting only the distinct ones).

The product of its (nonzero) digits is 174182400, while the sum is 64.

The spelling of 81647524953604 in words is "eighty-one trillion, six hundred forty-seven billion, five hundred twenty-four million, nine hundred fifty-three thousand, six hundred four".