81788343535 has 8 divisors (see below), whose sum is σ = 98918816256. Its totient is φ = 64915472160.

The previous prime is 81788343433. The next prime is 81788343547. The reversal of 81788343535 is 53534388718.

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

It is not a de Polignac number, because 81788343535 - 2⁹ = 81788343023 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, 64399636 + ... + 64400905.

It is an arithmetic number, because the mean of its divisors is an integer number (12364852032).

Almost surely, 2^81788343535 is an apocalyptic number.

81788343535 is a deficient number, since it is larger than the sum of its proper divisors (17130472721).

81788343535 is a wasteful number, since it uses less digits than its factorization.

81788343535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128800673.

The product of its digits is 9676800, while the sum is 55.

The spelling of 81788343535 in words is "eighty-one billion, seven hundred eighty-eight million, three hundred forty-three thousand, five hundred thirty-five".