199665859707 has 64 divisors (see below), whose sum is σ = 320076748800. Its totient is φ = 122533931520.

The previous prime is 199665859693. The next prime is 199665859829. The reversal of 199665859707 is 707958566991.

It is not a de Polignac number, because 199665859707 - 2⁷ = 199665859579 is a prime.

It is a super-2 number, since 2×199665859707² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199665859907) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58914169 + ... + 58917557.

It is an arithmetic number, because the mean of its divisors is an integer number (5001199200).

Almost surely, 2^199665859707 is an apocalyptic number.

199665859707 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

199665859707 is a deficient number, since it is larger than the sum of its proper divisors (120410889093).

199665859707 is a wasteful number, since it uses less digits than its factorization.

199665859707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6193 (or 6187 counting only the distinct ones).

The product of its (nonzero) digits is 257191200, while the sum is 72.

The spelling of 199665859707 in words is "one hundred ninety-nine billion, six hundred sixty-five million, eight hundred fifty-nine thousand, seven hundred seven".