199866455 has 16 divisors (see below), whose sum is σ = 248312064. Its totient is φ = 154275840.

The previous prime is 199866449. The next prime is 199866461. The reversal of 199866455 is 554668991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (199866449) and next prime (199866461).

It is a de Polignac number, because none of the positive numbers 2^k-199866455 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199866397 and 199866406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56087 + ... + 59543.

It is an arithmetic number, because the mean of its divisors is an integer number (15519504).

Almost surely, 2^199866455 is an apocalyptic number.

199866455 is a deficient number, since it is larger than the sum of its proper divisors (48445609).

199866455 is a wasteful number, since it uses less digits than its factorization.

199866455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3866.

The product of its digits is 2332800, while the sum is 53.

The square root of 199866455 is about 14137.4133065423. The cubic root of 199866455 is about 584.6733560113.

The spelling of 199866455 in words is "one hundred ninety-nine million, eight hundred sixty-six thousand, four hundred fifty-five".