19985057318 has 8 divisors (see below), whose sum is σ = 31555353720. Its totient is φ = 9466606080.

The previous prime is 19985057317. The next prime is 19985057341. The reversal of 19985057318 is 81375058991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19985057317) 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 3 ways as a sum of consecutive naturals, for example, 262961243 + ... + 262961318.

It is an arithmetic number, because the mean of its divisors is an integer number (3944419215).

Almost surely, 2^19985057318 is an apocalyptic number.

19985057318 is a deficient number, since it is larger than the sum of its proper divisors (11570296402).

19985057318 is a wasteful number, since it uses less digits than its factorization.

19985057318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525922582.

The product of its (nonzero) digits is 2721600, while the sum is 56.

The spelling of 19985057318 in words is "nineteen billion, nine hundred eighty-five million, fifty-seven thousand, three hundred eighteen".