199866349747 has 4 divisors (see below), whose sum is σ = 202112039160. Its totient is φ = 197620660336.

The previous prime is 199866349723. The next prime is 199866349763. The reversal of 199866349747 is 747943668991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199866349747 - 2⁷ = 199866349619 is a prime.

It is a super-2 number, since 2×199866349747² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199866349747.

It is not an unprimeable number, because it can be changed into a prime (199866340747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122844573 + ... + 1122844750.

It is an arithmetic number, because the mean of its divisors is an integer number (50528009790).

Almost surely, 2^199866349747 is an apocalyptic number.

199866349747 is a deficient number, since it is larger than the sum of its proper divisors (2245689413).

199866349747 is an equidigital number, since it uses as much as digits as its factorization.

199866349747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245689412.

The product of its digits is 493807104, while the sum is 73.

The spelling of 199866349747 in words is "one hundred ninety-nine billion, eight hundred sixty-six million, three hundred forty-nine thousand, seven hundred forty-seven".