18353670216671 has 2 divisors, whose sum is σ = 18353670216672. Its totient is φ = 18353670216670.

The previous prime is 18353670216647. The next prime is 18353670216743. The reversal of 18353670216671 is 17661207635381.

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-18353670216671 is a prime.

It is a super-2 number, since 2×18353670216671² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18353670216971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9176835108335 + 9176835108336.

It is an arithmetic number, because the mean of its divisors is an integer number (9176835108336).

Almost surely, 2^{18353670216671} is an apocalyptic number.

18353670216671 is a deficient number, since it is larger than the sum of its proper divisors (1).

18353670216671 is an equidigital number, since it uses as much as digits as its factorization.

18353670216671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 18353670216671 in words is "eighteen trillion, three hundred fifty-three billion, six hundred seventy million, two hundred sixteen thousand, six hundred seventy-one".