18419944927 has 2 divisors, whose sum is σ = 18419944928. Its totient is φ = 18419944926.

The previous prime is 18419944903. The next prime is 18419944931. The reversal of 18419944927 is 72944991481.

It is a strong prime.

It is an emirp because it is prime and its reverse (72944991481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18419944927 - 2¹⁹ = 18419420639 is a prime.

It is a super-2 number, since 2×18419944927² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18419944957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9209972463 + 9209972464.

It is an arithmetic number, because the mean of its divisors is an integer number (9209972464).

Almost surely, 2^18419944927 is an apocalyptic number.

18419944927 is a deficient number, since it is larger than the sum of its proper divisors (1).

18419944927 is an equidigital number, since it uses as much as digits as its factorization.

18419944927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 58.

The spelling of 18419944927 in words is "eighteen billion, four hundred nineteen million, nine hundred forty-four thousand, nine hundred twenty-seven".