19878462089 has 2 divisors, whose sum is σ = 19878462090. Its totient is φ = 19878462088.

The previous prime is 19878462059. The next prime is 19878462101. The reversal of 19878462089 is 98026487891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19581244489 + 297217600 = 139933^2 + 17240^2 .

It is a cyclic number.

It is not a de Polignac number, because 19878462089 - 2²⁰ = 19877413513 is a prime.

It is not a weakly prime, because it can be changed into another prime (19878462059) 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, 9939231044 + 9939231045.

It is an arithmetic number, because the mean of its divisors is an integer number (9939231045).

Almost surely, 2^19878462089 is an apocalyptic number.

It is an amenable number.

19878462089 is a deficient number, since it is larger than the sum of its proper divisors (1).

19878462089 is an equidigital number, since it uses as much as digits as its factorization.

19878462089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13934592, while the sum is 62.

The spelling of 19878462089 in words is "nineteen billion, eight hundred seventy-eight million, four hundred sixty-two thousand, eighty-nine".