18719627519 has 2 divisors, whose sum is σ = 18719627520. Its totient is φ = 18719627518.

The previous prime is 18719627501. The next prime is 18719627587. The reversal of 18719627519 is 91572691781.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (91572691781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18719627519 - 2⁸ = 18719627263 is a prime.

It is a super-2 number, since 2×18719627519² (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 (18719627119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9359813759 + 9359813760.

It is an arithmetic number, because the mean of its divisors is an integer number (9359813760).

Almost surely, 2^18719627519 is an apocalyptic number.

18719627519 is a deficient number, since it is larger than the sum of its proper divisors (1).

18719627519 is an equidigital number, since it uses as much as digits as its factorization.

18719627519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 56.

The spelling of 18719627519 in words is "eighteen billion, seven hundred nineteen million, six hundred twenty-seven thousand, five hundred nineteen".