18857855944919 has 2 divisors, whose sum is σ = 18857855944920. Its totient is φ = 18857855944918.

The previous prime is 18857855944913. The next prime is 18857855944933. The reversal of 18857855944919 is 91944955875881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18857855944919 - 2⁴ = 18857855944903 is a prime.

It is a super-2 number, since 2×18857855944919² (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 (18857855944913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428927972459 + 9428927972460.

It is an arithmetic number, because the mean of its divisors is an integer number (9428927972460).

Almost surely, 2^{18857855944919} is an apocalyptic number.

18857855944919 is a deficient number, since it is larger than the sum of its proper divisors (1).

18857855944919 is an equidigital number, since it uses as much as digits as its factorization.

18857855944919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472000, while the sum is 83.

The spelling of 18857855944919 in words is "eighteen trillion, eight hundred fifty-seven billion, eight hundred fifty-five million, nine hundred forty-four thousand, nine hundred nineteen".