199007886609 has 135 divisors (see below), whose sum is σ = 354273515937. Its totient is φ = 111004701696.

The previous prime is 199007886589. The next prime is 199007886611. The reversal of 199007886609 is 906688700991.

The square root of 199007886609 is 446103.

It is a perfect power (a square), and thus also a powerful number.

199007886609 is a `hidden beast` number, since 19 + 9 + 0 + 0 + 7 + 8 + 8 + 6 + 609 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 56205009 + 198951681600 = 7497^2 + 446040^2 .

It is not a de Polignac number, because 199007886609 - 2⁵ = 199007886577 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199007888609) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 2051627649 + ... + 2051627745.

Almost surely, 2^199007886609 is an apocalyptic number.

199007886609 is the 446103-rd square number.

199007886609 is the 223052-nd centered octagonal number.

It is an amenable number.

199007886609 is a deficient number, since it is larger than the sum of its proper divisors (155265629328).

199007886609 is an frugal number, since it uses more digits than its factorization.

199007886609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The spelling of 199007886609 in words is "one hundred ninety-nine billion, seven million, eight hundred eighty-six thousand, six hundred nine".