18867943417 has 2 divisors, whose sum is σ = 18867943418. Its totient is φ = 18867943416.

The previous prime is 18867943411. The next prime is 18867943439. The reversal of 18867943417 is 71434976881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12448088041 + 6419855376 = 111571^2 + 80124^2 .

It is a cyclic number.

It is not a de Polignac number, because 18867943417 - 2¹¹ = 18867941369 is a prime.

It is a super-2 number, since 2×18867943417² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18867943411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9433971708 + 9433971709.

It is an arithmetic number, because the mean of its divisors is an integer number (9433971709).

Almost surely, 2^18867943417 is an apocalyptic number.

It is an amenable number.

18867943417 is a deficient number, since it is larger than the sum of its proper divisors (1).

18867943417 is an equidigital number, since it uses as much as digits as its factorization.

18867943417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8128512, while the sum is 58.

The spelling of 18867943417 in words is "eighteen billion, eight hundred sixty-seven million, nine hundred forty-three thousand, four hundred seventeen".