199816161749 has 4 divisors (see below), whose sum is σ = 201042027936. Its totient is φ = 198590295564.

The previous prime is 199816161733. The next prime is 199816161799. The reversal of 199816161749 is 947161618991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199816161749 - 2⁴ = 199816161733 is a prime.

It is a super-2 number, since 2×199816161749² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199816161691 and 199816161700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199816161799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 612932849 + ... + 612933174.

It is an arithmetic number, because the mean of its divisors is an integer number (50260506984).

Almost surely, 2^199816161749 is an apocalyptic number.

It is an amenable number.

199816161749 is a deficient number, since it is larger than the sum of its proper divisors (1225866187).

199816161749 is a wasteful number, since it uses less digits than its factorization.

199816161749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225866186.

The product of its digits is 5878656, while the sum is 62.

The spelling of 199816161749 in words is "one hundred ninety-nine billion, eight hundred sixteen million, one hundred sixty-one thousand, seven hundred forty-nine".