81347403711 has 8 divisors (see below), whose sum is σ = 123957948544. Its totient is φ = 46484230680.

The previous prime is 81347403691. The next prime is 81347403713. The reversal of 81347403711 is 11730474318.

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

It is not a de Polignac number, because 81347403711 - 2⁹ = 81347403199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81347403711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81347403713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1936842925 + ... + 1936842966.

It is an arithmetic number, because the mean of its divisors is an integer number (15494743568).

Almost surely, 2^81347403711 is an apocalyptic number.

81347403711 is a deficient number, since it is larger than the sum of its proper divisors (42610544833).

81347403711 is a wasteful number, since it uses less digits than its factorization.

81347403711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3873685901.

The product of its (nonzero) digits is 56448, while the sum is 39.

The spelling of 81347403711 in words is "eighty-one billion, three hundred forty-seven million, four hundred three thousand, seven hundred eleven".