18914636620171 has 2 divisors, whose sum is σ = 18914636620172. Its totient is φ = 18914636620170.

The previous prime is 18914636620147. The next prime is 18914636620199. The reversal of 18914636620171 is 17102663641981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18914636620171 - 2³⁷ = 18777197666699 is a prime.

It is a super-2 number, since 2×18914636620171² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18914636620111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9457318310085 + 9457318310086.

It is an arithmetic number, because the mean of its divisors is an integer number (9457318310086).

Almost surely, 2^{18914636620171} is an apocalyptic number.

18914636620171 is a deficient number, since it is larger than the sum of its proper divisors (1).

18914636620171 is an equidigital number, since it uses as much as digits as its factorization.

18914636620171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 18914636620171 in words is "eighteen trillion, nine hundred fourteen billion, six hundred thirty-six million, six hundred twenty thousand, one hundred seventy-one".