18857444719 has 2 divisors, whose sum is σ = 18857444720. Its totient is φ = 18857444718.

The previous prime is 18857444717. The next prime is 18857444731. The reversal of 18857444719 is 91744475881.

It is a weak prime.

It is an emirp because it is prime and its reverse (91744475881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18857444719 - 2¹ = 18857444717 is a prime.

It is a super-2 number, since 2×18857444719² (a number of 21 digits) contains 22 as substring.

Together with 18857444717, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18857444717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428722359 + 9428722360.

It is an arithmetic number, because the mean of its divisors is an integer number (9428722360).

Almost surely, 2^18857444719 is an apocalyptic number.

18857444719 is a deficient number, since it is larger than the sum of its proper divisors (1).

18857444719 is an equidigital number, since it uses as much as digits as its factorization.

18857444719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9031680, while the sum is 58.

The spelling of 18857444719 in words is "eighteen billion, eight hundred fifty-seven million, four hundred forty-four thousand, seven hundred nineteen".