81765112803 has 16 divisors (see below), whose sum is σ = 120363981696. Its totient is φ = 48957568640.

The previous prime is 81765112783. The next prime is 81765112843. The reversal of 81765112803 is 30821156718.

It is a cyclic number.

It is not a de Polignac number, because 81765112803 - 2⁸ = 81765112547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81765112843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14923350 + ... + 14928827.

It is an arithmetic number, because the mean of its divisors is an integer number (7522748856).

Almost surely, 2^81765112803 is an apocalyptic number.

81765112803 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

81765112803 is a deficient number, since it is larger than the sum of its proper divisors (38598868893).

81765112803 is a wasteful number, since it uses less digits than its factorization.

81765112803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29852274.

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 81765112803 in words is "eighty-one billion, seven hundred sixty-five million, one hundred twelve thousand, eight hundred three".