19863869513 has 2 divisors, whose sum is σ = 19863869514. Its totient is φ = 19863869512.

The previous prime is 19863869449. The next prime is 19863869527. The reversal of 19863869513 is 31596836891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18092133049 + 1771736464 = 134507^2 + 42092^2 .

It is a cyclic number.

It is not a de Polignac number, because 19863869513 - 2⁶ = 19863869449 is a prime.

It is not a weakly prime, because it can be changed into another prime (19863869563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9931934756 + 9931934757.

It is an arithmetic number, because the mean of its divisors is an integer number (9931934757).

Almost surely, 2^19863869513 is an apocalyptic number.

It is an amenable number.

19863869513 is a deficient number, since it is larger than the sum of its proper divisors (1).

19863869513 is an equidigital number, since it uses as much as digits as its factorization.

19863869513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8398080, while the sum is 59.

The spelling of 19863869513 in words is "nineteen billion, eight hundred sixty-three million, eight hundred sixty-nine thousand, five hundred thirteen".