199475677129 has 9 divisors (see below), whose sum is σ = 205029605991. Its totient is φ = 194068364040.

The previous prime is 199475677123. The next prime is 199475677139. The reversal of 199475677129 is 921776574991.

The square root of 199475677129 is 446627.

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

It can be written as a sum of positive squares in only one way, i.e., 178493575225 + 20982101904 = 422485^2 + 144852^2 .

It is not a de Polignac number, because 199475677129 - 2¹³ = 199475668937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199475677123) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16519164 + ... + 16531234.

Almost surely, 2^199475677129 is an apocalyptic number.

199475677129 is the 446627-th square number.

199475677129 is the 223314-th centered octagonal number.

It is an amenable number.

199475677129 is a deficient number, since it is larger than the sum of its proper divisors (5553928862).

199475677129 is an frugal number, since it uses more digits than its factorization.

199475677129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24216 (or 12108 counting only the distinct ones).

The product of its digits is 60011280, while the sum is 67.

The spelling of 199475677129 in words is "one hundred ninety-nine billion, four hundred seventy-five million, six hundred seventy-seven thousand, one hundred twenty-nine".