199216709969 has 2 divisors, whose sum is σ = 199216709970. Its totient is φ = 199216709968.

The previous prime is 199216709957. The next prime is 199216710061. The reversal of 199216709969 is 969907612991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165272332369 + 33944377600 = 406537^2 + 184240^2 .

It is a cyclic number.

It is not a de Polignac number, because 199216709969 - 2²⁸ = 198948274513 is a prime.

It is a super-2 number, since 2×199216709969² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 199216709899 and 199216709908.

It is not a weakly prime, because it can be changed into another prime (199216709929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99608354984 + 99608354985.

It is an arithmetic number, because the mean of its divisors is an integer number (99608354985).

Almost surely, 2^199216709969 is an apocalyptic number.

It is an amenable number.

199216709969 is a deficient number, since it is larger than the sum of its proper divisors (1).

199216709969 is an equidigital number, since it uses as much as digits as its factorization.

199216709969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29760696, while the sum is 68.

The spelling of 199216709969 in words is "one hundred ninety-nine billion, two hundred sixteen million, seven hundred nine thousand, nine hundred sixty-nine".