161015511561605 has 16 divisors (see below), whose sum is σ = 194694592422528. Its totient is φ = 127828433928000.

The previous prime is 161015511561587. The next prime is 161015511561637. The reversal of 161015511561605 is 506165115510161.

It is not a de Polignac number, because 161015511561605 - 2¹⁰ = 161015511560581 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 150425195 + ... + 151491815.

It is an arithmetic number, because the mean of its divisors is an integer number (12168412026408).

Almost surely, 2^{161015511561605} is an apocalyptic number.

It is an amenable number.

161015511561605 is a deficient number, since it is larger than the sum of its proper divisors (33679080860923).

161015511561605 is a wasteful number, since it uses less digits than its factorization.

161015511561605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297228.

The product of its (nonzero) digits is 135000, while the sum is 44.

The spelling of 161015511561605 in words is "one hundred sixty-one trillion, fifteen billion, five hundred eleven million, five hundred sixty-one thousand, six hundred five".