199507657849 has 8 divisors (see below), whose sum is σ = 200960786880. Its totient is φ = 198054783696.

The previous prime is 199507657847. The next prime is 199507657871. The reversal of 199507657849 is 948756705991.

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

It is a cyclic number.

It is not a de Polignac number, because 199507657849 - 2¹ = 199507657847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199507657847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1680519 + ... + 1795315.

It is an arithmetic number, because the mean of its divisors is an integer number (25120098360).

Almost surely, 2^199507657849 is an apocalyptic number.

It is an amenable number.

199507657849 is a deficient number, since it is larger than the sum of its proper divisors (1453129031).

199507657849 is a wasteful number, since it uses less digits than its factorization.

199507657849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127439.

The product of its (nonzero) digits is 171460800, while the sum is 70.

The spelling of 199507657849 in words is "one hundred ninety-nine billion, five hundred seven million, six hundred fifty-seven thousand, eight hundred forty-nine".