199785718430 has 16 divisors (see below), whose sum is σ = 359630647200. Its totient is φ = 79910653152.

The previous prime is 199785718423. The next prime is 199785718519. The reversal of 199785718430 is 34817587991.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217514 + ... + 668493.

It is an arithmetic number, because the mean of its divisors is an integer number (22476915450).

Almost surely, 2^199785718430 is an apocalyptic number.

199785718430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199785718430 is a deficient number, since it is larger than the sum of its proper divisors (159844928770).

199785718430 is a wasteful number, since it uses less digits than its factorization.

199785718430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908563.

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 199785718430 in words is "one hundred ninety-nine billion, seven hundred eighty-five million, seven hundred eighteen thousand, four hundred thirty".