19187915988047 has 2 divisors, whose sum is σ = 19187915988048. Its totient is φ = 19187915988046.

The previous prime is 19187915988023. The next prime is 19187915988071. The reversal of 19187915988047 is 74088951978191.

It is a balanced prime because it is at equal distance from previous prime (19187915988023) and next prime (19187915988071).

It is a cyclic number.

It is not a de Polignac number, because 19187915988047 - 2⁴⁴ = 1595729943631 is a prime.

It is a super-2 number, since 2×19187915988047² (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 (19187915984047) 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, 9593957994023 + 9593957994024.

It is an arithmetic number, because the mean of its divisors is an integer number (9593957994024).

Almost surely, 2^{19187915988047} is an apocalyptic number.

19187915988047 is a deficient number, since it is larger than the sum of its proper divisors (1).

19187915988047 is an equidigital number, since it uses as much as digits as its factorization.

19187915988047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 365783040, while the sum is 77.

The spelling of 19187915988047 in words is "nineteen trillion, one hundred eighty-seven billion, nine hundred fifteen million, nine hundred eighty-eight thousand, forty-seven".