81744296594 has 4 divisors (see below), whose sum is σ = 122616444894. Its totient is φ = 40872148296.

The previous prime is 81744296567. The next prime is 81744296611. The reversal of 81744296594 is 49569244718.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 50622750025 + 31121546569 = 224995^2 + 176413^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20436074147 + ... + 20436074150.

Almost surely, 2^81744296594 is an apocalyptic number.

81744296594 is a deficient number, since it is larger than the sum of its proper divisors (40872148300).

81744296594 is a wasteful number, since it uses less digits than its factorization.

81744296594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40872148299.

The product of its digits is 17418240, while the sum is 59.

The spelling of 81744296594 in words is "eighty-one billion, seven hundred forty-four million, two hundred ninety-six thousand, five hundred ninety-four".