19898666385 has 32 divisors (see below), whose sum is σ = 34300721280. Its totient is φ = 9792327168.

The previous prime is 19898666371. The next prime is 19898666441. The reversal of 19898666385 is 58366689891.

It is not a de Polignac number, because 19898666385 - 2⁷ = 19898666257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 499317 + ... + 537693.

It is an arithmetic number, because the mean of its divisors is an integer number (1071897540).

Almost surely, 2^19898666385 is an apocalyptic number.

19898666385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19898666385 is a deficient number, since it is larger than the sum of its proper divisors (14402054895).

19898666385 is a wasteful number, since it uses less digits than its factorization.

19898666385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41057.

The product of its digits is 134369280, while the sum is 69.

The spelling of 19898666385 in words is "nineteen billion, eight hundred ninety-eight million, six hundred sixty-six thousand, three hundred eighty-five".