199343751685 has 16 divisors (see below), whose sum is σ = 257644670976. Its totient is φ = 147189860928.

The previous prime is 199343751589. The next prime is 199343751703. The reversal of 199343751685 is 586157343991.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 199343751685 - 2²⁵ = 199310197253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367522 + ... + 730588.

It is an arithmetic number, because the mean of its divisors is an integer number (16102791936).

Almost surely, 2^199343751685 is an apocalyptic number.

It is an amenable number.

199343751685 is a deficient number, since it is larger than the sum of its proper divisors (58300919291).

199343751685 is a wasteful number, since it uses less digits than its factorization.

199343751685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371532.

The product of its digits is 24494400, while the sum is 61.

The spelling of 199343751685 in words is "one hundred ninety-nine billion, three hundred forty-three million, seven hundred fifty-one thousand, six hundred eighty-five".