19386064556389 has 2 divisors, whose sum is σ = 19386064556390. Its totient is φ = 19386064556388.

The previous prime is 19386064556377. The next prime is 19386064556543. The reversal of 19386064556389 is 98365546068391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19175903740900 + 210160815489 = 4379030^2 + 458433^2 .

It is a cyclic number.

It is not a de Polignac number, because 19386064556389 - 2³⁵ = 19351704818021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19386064550389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9693032278194 + 9693032278195.

It is an arithmetic number, because the mean of its divisors is an integer number (9693032278195).

Almost surely, 2^{19386064556389} is an apocalyptic number.

It is an amenable number.

19386064556389 is a deficient number, since it is larger than the sum of its proper divisors (1).

19386064556389 is an equidigital number, since it uses as much as digits as its factorization.

19386064556389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1007769600, while the sum is 73.

The spelling of 19386064556389 in words is "nineteen trillion, three hundred eighty-six billion, sixty-four million, five hundred fifty-six thousand, three hundred eighty-nine".