199996591361 has 6 divisors (see below), whose sum is σ = 232649096130. Its totient is φ = 171425649696.

The previous prime is 199996591351. The next prime is 199996591411. The reversal of 199996591361 is 163195699991.

It can be written as a sum of positive squares in only one way, i.e., 182478480625 + 17518110736 = 427175^2 + 132356^2 .

It is not a de Polignac number, because 199996591361 - 2³⁴ = 182816722177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199996591291 and 199996591300.

It is not an unprimeable number, because it can be changed into a prime (199996591321) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2040781496 + ... + 2040781593.

It is an arithmetic number, because the mean of its divisors is an integer number (38774849355).

Almost surely, 2^199996591361 is an apocalyptic number.

It is an amenable number.

199996591361 is a deficient number, since it is larger than the sum of its proper divisors (32652504769).

199996591361 is an equidigital number, since it uses as much as digits as its factorization.

199996591361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4081563103 (or 4081563096 counting only the distinct ones).

The product of its digits is 31886460, while the sum is 68.

The spelling of 199996591361 in words is "one hundred ninety-nine billion, nine hundred ninety-six million, five hundred ninety-one thousand, three hundred sixty-one".