18355518353827 has 2 divisors, whose sum is σ = 18355518353828. Its totient is φ = 18355518353826.

The previous prime is 18355518353771. The next prime is 18355518353891. The reversal of 18355518353827 is 72835381555381.

It is an a-pointer prime, because the next prime (18355518353891) can be obtained adding 18355518353827 to its sum of digits (64).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18355518353827 - 2⁴³ = 9559425331619 is a prime.

It is not a weakly prime, because it can be changed into another prime (18355518353527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9177759176913 + 9177759176914.

It is an arithmetic number, because the mean of its divisors is an integer number (9177759176914).

Almost surely, 2^{18355518353827} is an apocalyptic number.

18355518353827 is a deficient number, since it is larger than the sum of its proper divisors (1).

18355518353827 is an equidigital number, since it uses as much as digits as its factorization.

18355518353827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960000, while the sum is 64.

The spelling of 18355518353827 in words is "eighteen trillion, three hundred fifty-five billion, five hundred eighteen million, three hundred fifty-three thousand, eight hundred twenty-seven".