81773024775 has 96 divisors (see below), whose sum is σ = 150903466560. Its totient is φ = 38795796480.

The previous prime is 81773024761. The next prime is 81773024783. The reversal of 81773024775 is 57742037718.

It is not a de Polignac number, because 81773024775 - 2⁷ = 81773024647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16764637 + ... + 16769513.

It is an arithmetic number, because the mean of its divisors is an integer number (1571911110).

Almost surely, 2^81773024775 is an apocalyptic number.

81773024775 is a deficient number, since it is larger than the sum of its proper divisors (69130441785).

81773024775 is a wasteful number, since it uses less digits than its factorization.

81773024775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5525 (or 5520 counting only the distinct ones).

The product of its (nonzero) digits is 2304960, while the sum is 51.

The spelling of 81773024775 in words is "eighty-one billion, seven hundred seventy-three million, twenty-four thousand, seven hundred seventy-five".