19870611899 has 32 divisors (see below), whose sum is σ = 20846368320. Its totient is φ = 18930143232.

The previous prime is 19870611811. The next prime is 19870611913. The reversal of 19870611899 is 99811607891.

It is a cyclic number.

It is not a de Polignac number, because 19870611899 - 2¹⁶ = 19870546363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19870611809) 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 in 31 ways as a sum of consecutive naturals, for example, 86771117 + ... + 86771345.

It is an arithmetic number, because the mean of its divisors is an integer number (651449010).

Almost surely, 2^19870611899 is an apocalyptic number.

19870611899 is a deficient number, since it is larger than the sum of its proper divisors (975756421).

19870611899 is a wasteful number, since it uses less digits than its factorization.

19870611899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639.

The product of its (nonzero) digits is 1959552, while the sum is 59.

The spelling of 19870611899 in words is "nineteen billion, eight hundred seventy million, six hundred eleven thousand, eight hundred ninety-nine".