161061116561655 has 16 divisors (see below), whose sum is σ = 264662591540064. Its totient is φ = 83577660485760.

The previous prime is 161061116561641. The next prime is 161061116561693. The reversal of 161061116561655 is 556165611160161.

It is not a de Polignac number, because 161061116561655 - 2⁵ = 161061116561623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161061116561598 and 161061116561607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145100104456 + ... + 145100105565.

It is an arithmetic number, because the mean of its divisors is an integer number (16541411971254).

Almost surely, 2^{161061116561655} is an apocalyptic number.

161061116561655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161061116561655 is a deficient number, since it is larger than the sum of its proper divisors (103601474978409).

161061116561655 is a wasteful number, since it uses less digits than its factorization.

161061116561655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290200210066.

The product of its (nonzero) digits is 972000, while the sum is 51.

The spelling of 161061116561655 in words is "one hundred sixty-one trillion, sixty-one billion, one hundred sixteen million, five hundred sixty-one thousand, six hundred fifty-five".