161206211213 has 4 divisors (see below), whose sum is σ = 161271558720. Its totient is φ = 161140863708.

The previous prime is 161206211209. The next prime is 161206211233. The reversal of 161206211213 is 312112602161.

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 161206211213 - 2² = 161206211209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161206211203) 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, 32670053 + ... + 32674986.

It is an arithmetic number, because the mean of its divisors is an integer number (40317889680).

Almost surely, 2^161206211213 is an apocalyptic number.

It is an amenable number.

161206211213 is a deficient number, since it is larger than the sum of its proper divisors (65347507).

161206211213 is an equidigital number, since it uses as much as digits as its factorization.

161206211213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65347506.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 161206211213 its reverse (312112602161), we get a palindrome (473318813374).

The spelling of 161206211213 in words is "one hundred sixty-one billion, two hundred six million, two hundred eleven thousand, two hundred thirteen".