199665957 has 8 divisors (see below), whose sum is σ = 275401440. Its totient is φ = 128520560.

The previous prime is 199665931. The next prime is 199665979. The reversal of 199665957 is 759566991.

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 199665957 - 2²³ = 191277349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199665897 and 199665906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199665997) 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, 1147419 + ... + 1147592.

It is an arithmetic number, because the mean of its divisors is an integer number (34425180).

Almost surely, 2^199665957 is an apocalyptic number.

It is an amenable number.

199665957 is a deficient number, since it is larger than the sum of its proper divisors (75735483).

199665957 is a wasteful number, since it uses less digits than its factorization.

199665957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295043.

The product of its digits is 4592700, while the sum is 57.

The square root of 199665957 is about 14130.3204846882. The cubic root of 199665957 is about 584.4777836575.

The spelling of 199665957 in words is "one hundred ninety-nine million, six hundred sixty-five thousand, nine hundred fifty-seven".