19886979433 has 2 divisors, whose sum is σ = 19886979434. Its totient is φ = 19886979432.

The previous prime is 19886979421. The next prime is 19886979493. The reversal of 19886979433 is 33497968891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18736955689 + 1150023744 = 136883^2 + 33912^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19886979433 is a prime.

It is not a weakly prime, because it can be changed into another prime (19886979493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9943489716 + 9943489717.

It is an arithmetic number, because the mean of its divisors is an integer number (9943489717).

Almost surely, 2^19886979433 is an apocalyptic number.

It is an amenable number.

19886979433 is a deficient number, since it is larger than the sum of its proper divisors (1).

19886979433 is an equidigital number, since it uses as much as digits as its factorization.

19886979433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70543872, while the sum is 67.

The spelling of 19886979433 in words is "nineteen billion, eight hundred eighty-six million, nine hundred seventy-nine thousand, four hundred thirty-three".