81790443535 has 8 divisors (see below), whose sum is σ = 98300234016. Its totient is φ = 65331220320.

The previous prime is 81790443529. The next prime is 81790443551. The reversal of 81790443535 is 53534409718.

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

It is not a de Polignac number, because 81790443535 - 2⁹ = 81790443023 is a prime.

It is a Duffinian number.

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, 12638256 + ... + 12644725.

It is an arithmetic number, because the mean of its divisors is an integer number (12287529252).

Almost surely, 2^81790443535 is an apocalyptic number.

81790443535 is a deficient number, since it is larger than the sum of its proper divisors (16509790481).

81790443535 is a wasteful number, since it uses less digits than its factorization.

81790443535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25283633.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 81790443535 in words is "eighty-one billion, seven hundred ninety million, four hundred forty-three thousand, five hundred thirty-five".