19879734563567 has 2 divisors, whose sum is σ = 19879734563568. Its totient is φ = 19879734563566.

The previous prime is 19879734563473. The next prime is 19879734563581. The reversal of 19879734563567 is 76536543797891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19879734563567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19879734563491 and 19879734563500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19879734563267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9939867281783 + 9939867281784.

It is an arithmetic number, because the mean of its divisors is an integer number (9939867281784).

Almost surely, 2^{19879734563567} is an apocalyptic number.

19879734563567 is a deficient number, since it is larger than the sum of its proper divisors (1).

19879734563567 is an equidigital number, since it uses as much as digits as its factorization.

19879734563567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7201353600, while the sum is 80.

The spelling of 19879734563567 in words is "nineteen trillion, eight hundred seventy-nine billion, seven hundred thirty-four million, five hundred sixty-three thousand, five hundred sixty-seven".