199000661 has 8 divisors (see below), whose sum is σ = 210004800. Its totient is φ = 188049600.

The previous prime is 199000651. The next prime is 199000663. The reversal of 199000661 is 166000991.

It is a happy number.

199000661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 199000661 - 2¹⁴ = 198984277 is a prime.

199000661 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199000663) 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, 5441 + ... + 20678.

It is an arithmetic number, because the mean of its divisors is an integer number (26250600).

Almost surely, 2^199000661 is an apocalyptic number.

It is an amenable number.

199000661 is a deficient number, since it is larger than the sum of its proper divisors (11004139).

199000661 is a wasteful number, since it uses less digits than its factorization.

199000661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26539.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 199000661 is about 14106.7594081703. The cubic root of 199000661 is about 583.8278924958.

The spelling of 199000661 in words is "one hundred ninety-nine million, six hundred sixty-one", and thus it is an aban number.