161965667199 has 8 divisors (see below), whose sum is σ = 246804826240. Its totient is φ = 92551809816.

The previous prime is 161965667183. The next prime is 161965667239. The reversal of 161965667199 is 991766569161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161965667199 - 2⁴ = 161965667183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161965667399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3856325389 + ... + 3856325430.

It is an arithmetic number, because the mean of its divisors is an integer number (30850603280).

Almost surely, 2^161965667199 is an apocalyptic number.

161965667199 is a deficient number, since it is larger than the sum of its proper divisors (84839159041).

161965667199 is an equidigital number, since it uses as much as digits as its factorization.

161965667199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7712650829.

The product of its digits is 33067440, while the sum is 66.

The spelling of 161965667199 in words is "one hundred sixty-one billion, nine hundred sixty-five million, six hundred sixty-seven thousand, one hundred ninety-nine".