19879963987969 has 2 divisors, whose sum is σ = 19879963987970. Its totient is φ = 19879963987968.

The previous prime is 19879963987817. The next prime is 19879963987979. The reversal of 19879963987969 is 96978936997891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19602933350400 + 277030637569 = 4427520^2 + 526337^2 .

It is a cyclic number.

It is not a de Polignac number, because 19879963987969 - 2²⁹ = 19879427117057 is a prime.

It is a super-2 number, since 2×19879963987969² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19879963987979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9939981993984 + 9939981993985.

It is an arithmetic number, because the mean of its divisors is an integer number (9939981993985).

Almost surely, 2^{19879963987969} is an apocalyptic number.

It is an amenable number.

19879963987969 is a deficient number, since it is larger than the sum of its proper divisors (1).

19879963987969 is an equidigital number, since it uses as much as digits as its factorization.

19879963987969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 179992689408, while the sum is 100.

The spelling of 19879963987969 in words is "nineteen trillion, eight hundred seventy-nine billion, nine hundred sixty-three million, nine hundred eighty-seven thousand, nine hundred sixty-nine".