818454454819 has 4 divisors (see below), whose sum is σ = 818522461744. Its totient is φ = 818386447896.

The previous prime is 818454454787. The next prime is 818454454847. The reversal of 818454454819 is 918454454818.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 818454454819 - 2⁵ = 818454454787 is a prime.

It is a super-2 number, since 2×818454454819² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818454454889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33985407 + ... + 34009480.

It is an arithmetic number, because the mean of its divisors is an integer number (204630615436).

Almost surely, 2^818454454819 is an apocalyptic number.

818454454819 is a deficient number, since it is larger than the sum of its proper divisors (68006925).

818454454819 is a wasteful number, since it uses less digits than its factorization.

818454454819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68006924.

The product of its digits is 29491200, while the sum is 61.

Subtracting 818454454819 from its reverse (918454454818), we obtain a palindrome (99999999999).

The spelling of 818454454819 in words is "eight hundred eighteen billion, four hundred fifty-four million, four hundred fifty-four thousand, eight hundred nineteen".