81300783359 has 4 divisors (see below), whose sum is σ = 81484307016. Its totient is φ = 81117259704.

The previous prime is 81300783301. The next prime is 81300783371. The reversal of 81300783359 is 95338700318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95338700318 = 2 ⋅47669350159.

It is a cyclic number.

It is not a de Polignac number, because 81300783359 - 2²⁰ = 81299734783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81300783379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91761164 + ... + 91762049.

It is an arithmetic number, because the mean of its divisors is an integer number (20371076754).

Almost surely, 2^81300783359 is an apocalyptic number.

81300783359 is a deficient number, since it is larger than the sum of its proper divisors (183523657).

81300783359 is a wasteful number, since it uses less digits than its factorization.

81300783359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183523656.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 81300783359 in words is "eighty-one billion, three hundred million, seven hundred eighty-three thousand, three hundred fifty-nine".