1818318237647 has 2 divisors, whose sum is σ = 1818318237648. Its totient is φ = 1818318237646.

The previous prime is 1818318237641. The next prime is 1818318237779. The reversal of 1818318237647 is 7467328138181.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1818318237647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818318237641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909159118823 + 909159118824.

It is an arithmetic number, because the mean of its divisors is an integer number (909159118824).

Almost surely, 2^{1818318237647} is an apocalyptic number.

1818318237647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818318237647 is an equidigital number, since it uses as much as digits as its factorization.

1818318237647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10838016, while the sum is 59.

The spelling of 1818318237647 in words is "one trillion, eight hundred eighteen billion, three hundred eighteen million, two hundred thirty-seven thousand, six hundred forty-seven".