81818916451711 has 6 divisors (see below), whose sum is σ = 83765932312920. Its totient is φ = 79916150951028.

The previous prime is 81818916451651. The next prime is 81818916451721. The reversal of 81818916451711 is 11715461981818.

It is not a de Polignac number, because 81818916451711 - 2²³ = 81818908063103 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 81818916451711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81818916451721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22125178371 + ... + 22125182068.

It is an arithmetic number, because the mean of its divisors is an integer number (13960988718820).

Almost surely, 2^{81818916451711} is an apocalyptic number.

81818916451711 is a deficient number, since it is larger than the sum of its proper divisors (1947015861209).

81818916451711 is an equidigital number, since it uses as much as digits as its factorization.

81818916451711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44250360525 (or 44250360482 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 61.

The spelling of 81818916451711 in words is "eighty-one trillion, eight hundred eighteen billion, nine hundred sixteen million, four hundred fifty-one thousand, seven hundred eleven".