19764489187 has 16 divisors (see below), whose sum is σ = 22112386560. Its totient is φ = 17555743872.

The previous prime is 19764489181. The next prime is 19764489197. The reversal of 19764489187 is 78198446791.

It is not a de Polignac number, because 19764489187 - 2¹⁵ = 19764456419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19764489181) 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 15 ways as a sum of consecutive naturals, for example, 31383 + ... + 201280.

It is an arithmetic number, because the mean of its divisors is an integer number (1382024160).

Almost surely, 2^19764489187 is an apocalyptic number.

19764489187 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

19764489187 is a deficient number, since it is larger than the sum of its proper divisors (2347897373).

19764489187 is a wasteful number, since it uses less digits than its factorization.

19764489187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232962.

The product of its digits is 24385536, while the sum is 64.

The spelling of 19764489187 in words is "nineteen billion, seven hundred sixty-four million, four hundred eighty-nine thousand, one hundred eighty-seven".