199664351 has 4 divisors (see below), whose sum is σ = 204307752. Its totient is φ = 195020952.

The previous prime is 199664323. The next prime is 199664359. The reversal of 199664351 is 153466991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 153466991 = 317 ⋅484123.

It is a cyclic number.

It is not a de Polignac number, because 199664351 - 2⁶ = 199664287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199664359) 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, 2321636 + ... + 2321721.

It is an arithmetic number, because the mean of its divisors is an integer number (51076938).

Almost surely, 2^199664351 is an apocalyptic number.

199664351 is a deficient number, since it is larger than the sum of its proper divisors (4643401).

199664351 is an equidigital number, since it uses as much as digits as its factorization.

199664351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4643400.

The product of its digits is 174960, while the sum is 44.

The square root of 199664351 is about 14130.2636564220. The cubic root of 199664351 is about 584.4762165837.

The spelling of 199664351 in words is "one hundred ninety-nine million, six hundred sixty-four thousand, three hundred fifty-one".