816342767243618 has 4 divisors (see below), whose sum is σ = 1224514150865430. Its totient is φ = 408171383621808.

The previous prime is 816342767243587. The next prime is 816342767243677.

816342767243618 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in only one way, i.e., 790830742054369 + 25512025189249 = 28121713^2 + 5050943^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204085691810903 + ... + 204085691810906.

Almost surely, 2^{816342767243618} is an apocalyptic number.

816342767243618 is a deficient number, since it is larger than the sum of its proper divisors (408171383621812).

816342767243618 is a wasteful number, since it uses less digits than its factorization.

816342767243618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408171383621811.

The product of its digits is 390168576, while the sum is 68.

The spelling of 816342767243618 in words is "eight hundred sixteen trillion, three hundred forty-two billion, seven hundred sixty-seven million, two hundred forty-three thousand, six hundred eighteen".