81593296845 has 8 divisors (see below), whose sum is σ = 130549274976. Its totient is φ = 43516424976.

The previous prime is 81593296793. The next prime is 81593296853. The reversal of 81593296845 is 54869239518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81593296845 - 2¹⁶ = 81593231309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2719776547 + ... + 2719776576.

It is an arithmetic number, because the mean of its divisors is an integer number (16318659372).

Almost surely, 2^81593296845 is an apocalyptic number.

It is an amenable number.

81593296845 is a deficient number, since it is larger than the sum of its proper divisors (48955978131).

81593296845 is a wasteful number, since it uses less digits than its factorization.

81593296845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5439553131.

The product of its digits is 18662400, while the sum is 60.

The spelling of 81593296845 in words is "eighty-one billion, five hundred ninety-three million, two hundred ninety-six thousand, eight hundred forty-five".