19638889087 has 2 divisors, whose sum is σ = 19638889088. Its totient is φ = 19638889086.

The previous prime is 19638889057. The next prime is 19638889091. The reversal of 19638889087 is 78098883691.

It is a strong prime.

It is an emirp because it is prime and its reverse (78098883691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19638889087 - 2⁷ = 19638888959 is a prime.

It is a super-3 number, since 3×19638889087³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19638889027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9819444543 + 9819444544.

It is an arithmetic number, because the mean of its divisors is an integer number (9819444544).

Almost surely, 2^19638889087 is an apocalyptic number.

19638889087 is a deficient number, since it is larger than the sum of its proper divisors (1).

19638889087 is an equidigital number, since it uses as much as digits as its factorization.

19638889087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41803776, while the sum is 67.

The spelling of 19638889087 in words is "nineteen billion, six hundred thirty-eight million, eight hundred eighty-nine thousand, eighty-seven".