199439724469969 has 3 divisors (see below), whose sum is σ = 199439738592283. Its totient is φ = 199439710347656.

The previous prime is 199439724469963. The next prime is 199439724470059. The reversal of 199439724469969 is 969964427934991.

The square root of 199439724469969 is 14122313.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 73351259766225 + 126088464703744 = 8564535^2 + 11228912^2 .

It is a de Polignac number, because none of the positive numbers 2^k-199439724469969 is a prime.

It is a super-2 number, since 2×199439724469969² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199439724469963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7061157 + ... + 21183469.

Almost surely, 2^{199439724469969} is an apocalyptic number.

199439724469969 is the 14122313-rd square number.

199439724469969 is the 7061157-th centered octagonal number.

It is an amenable number.

199439724469969 is a deficient number, since it is larger than the sum of its proper divisors (14122314).

199439724469969 is an frugal number, since it uses more digits than its factorization.

199439724469969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28244626 (or 14122313 counting only the distinct ones).

The product of its digits is 51426482688, while the sum is 91.

The spelling of 199439724469969 in words is "one hundred ninety-nine trillion, four hundred thirty-nine billion, seven hundred twenty-four million, four hundred sixty-nine thousand, nine hundred sixty-nine".