82719991819 has 8 divisors (see below), whose sum is σ = 85613470560. Its totient is φ = 79829250816.

The previous prime is 82719991817. The next prime is 82719991831. The reversal of 82719991819 is 91819991728.

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

It is a cyclic number.

It is not a de Polignac number, because 82719991819 - 2¹ = 82719991817 is a prime.

It is a super-2 number, since 2×82719991819² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82719991817) 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, 622854 + ... + 743899.

It is an arithmetic number, because the mean of its divisors is an integer number (10701683820).

Almost surely, 2^82719991819 is an apocalyptic number.

82719991819 is a deficient number, since it is larger than the sum of its proper divisors (2893478741).

82719991819 is a wasteful number, since it uses less digits than its factorization.

82719991819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368869.

The product of its digits is 5878656, while the sum is 64.

Subtracting 82719991819 from its reverse (91819991728), we obtain a palindrome (9099999909).

The spelling of 82719991819 in words is "eighty-two billion, seven hundred nineteen million, nine hundred ninety-one thousand, eight hundred nineteen".