161206211215 has 64 divisors (see below), whose sum is σ = 232911562752. Its totient is φ = 104722675200.

The previous prime is 161206211209. The next prime is 161206211233. The reversal of 161206211215 is 512112602161.

It is not a de Polignac number, because 161206211215 - 2⁹ = 161206210703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 68860945 + ... + 68863285.

It is an arithmetic number, because the mean of its divisors is an integer number (3639243168).

Almost surely, 2^161206211215 is an apocalyptic number.

161206211215 is a deficient number, since it is larger than the sum of its proper divisors (71705351537).

161206211215 is a wasteful number, since it uses less digits than its factorization.

161206211215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160.

The product of its (nonzero) digits is 1440, while the sum is 28.

Adding to 161206211215 its reverse (512112602161), we get a palindrome (673318813376).

The spelling of 161206211215 in words is "one hundred sixty-one billion, two hundred six million, two hundred eleven thousand, two hundred fifteen".