1218258835993 has 2 divisors, whose sum is σ = 1218258835994. Its totient is φ = 1218258835992.

The previous prime is 1218258835931. The next prime is 1218258836009. The reversal of 1218258835993 is 3995388528121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 877159618624 + 341099217369 = 936568^2 + 584037^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218258835993 - 2¹³ = 1218258827801 is a prime.

It is a super-3 number, since 3×1218258835993³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1218258835793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609129417996 + 609129417997.

It is an arithmetic number, because the mean of its divisors is an integer number (609129417997).

Almost surely, 2^{1218258835993} is an apocalyptic number.

It is an amenable number.

1218258835993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218258835993 is an equidigital number, since it uses as much as digits as its factorization.

1218258835993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37324800, while the sum is 64.

The spelling of 1218258835993 in words is "one trillion, two hundred eighteen billion, two hundred fifty-eight million, eight hundred thirty-five thousand, nine hundred ninety-three".