161206211216 has 20 divisors (see below), whose sum is σ = 315846441900. Its totient is φ = 79697452032.

The previous prime is 161206211209. The next prime is 161206211233. The reversal of 161206211216 is 612112602161.

It can be written as a sum of positive squares in 2 ways, for example, as 47707296400 + 113498914816 = 218420^2 + 336896^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56601881 + ... + 56604728.

It is an arithmetic number, because the mean of its divisors is an integer number (15792322095).

Almost surely, 2^161206211216 is an apocalyptic number.

161206211216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161206211216 is a deficient number, since it is larger than the sum of its proper divisors (154640230684).

161206211216 is a wasteful number, since it uses less digits than its factorization.

161206211216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113206706 (or 113206700 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

Adding to 161206211216 its reverse (612112602161), we get a palindrome (773318813377).

The spelling of 161206211216 in words is "one hundred sixty-one billion, two hundred six million, two hundred eleven thousand, two hundred sixteen".