1218233407537 has 2 divisors, whose sum is σ = 1218233407538. Its totient is φ = 1218233407536.

The previous prime is 1218233407513. The next prime is 1218233407571. The reversal of 1218233407537 is 7357043328121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1067783288896 + 150450118641 = 1033336^2 + 387879^2 .

It is an emirp because it is prime and its reverse (7357043328121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1218233407537 - 2³⁹ = 668477593649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218233407337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609116703768 + 609116703769.

It is an arithmetic number, because the mean of its divisors is an integer number (609116703769).

Almost surely, 2^{1218233407537} is an apocalyptic number.

It is an amenable number.

1218233407537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218233407537 is an equidigital number, since it uses as much as digits as its factorization.

1218233407537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 1218233407537 in words is "one trillion, two hundred eighteen billion, two hundred thirty-three million, four hundred seven thousand, five hundred thirty-seven".