199555092201609 has 27 divisors (see below), whose sum is σ = 288591845817639. Its totient is φ = 132877410629040.

The previous prime is 199555092201589. The next prime is 199555092201617. The reversal of 199555092201609 is 906102290555991.

The square root of 199555092201609 is 14126397.

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

199555092201609 is a `hidden beast` number, since 1 + 9 + 95 + 5 + 509 + 2 + 20 + 16 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 74369874697209 + 125185217504400 = 8623797^2 + 11188620^2 .

It is not a de Polignac number, because 199555092201609 - 2⁷ = 199555092201481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199555092201809) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 43184393319 + ... + 43184397939.

Almost surely, 2^{199555092201609} is an apocalyptic number.

199555092201609 is the 14126397-th square number.

199555092201609 is the 7063199-th centered octagonal number.

It is an amenable number.

199555092201609 is a deficient number, since it is larger than the sum of its proper divisors (89036753616030).

199555092201609 is an frugal number, since it uses more digits than its factorization.

199555092201609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11286 (or 5643 counting only the distinct ones).

The product of its (nonzero) digits is 19683000, while the sum is 63.

The spelling of 199555092201609 in words is "one hundred ninety-nine trillion, five hundred fifty-five billion, ninety-two million, two hundred one thousand, six hundred nine".