161616566065105 has 16 divisors (see below), whose sum is σ = 194986835746560. Its totient is φ = 128596590166912.

The previous prime is 161616566065091. The next prime is 161616566065111. The reversal of 161616566065105 is 501560665616161.

It is a cyclic number.

It is not a de Polignac number, because 161616566065105 - 2³⁷ = 161479127111633 is a prime.

It is a super-2 number, since 2×161616566065105² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80779564 + ... + 82756093.

It is an arithmetic number, because the mean of its divisors is an integer number (12186677234160).

Almost surely, 2^{161616566065105} is an apocalyptic number.

It is an amenable number.

161616566065105 is a deficient number, since it is larger than the sum of its proper divisors (33370269681455).

161616566065105 is a wasteful number, since it uses less digits than its factorization.

161616566065105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163536728.

The product of its (nonzero) digits is 5832000, while the sum is 55.

The spelling of 161616566065105 in words is "one hundred sixty-one trillion, six hundred sixteen billion, five hundred sixty-six million, sixty-five thousand, one hundred five".