166615065561005 has 32 divisors (see below), whose sum is σ = 219937614336000. Its totient is φ = 120715758499392.

The previous prime is 166615065560981. The next prime is 166615065561017. The reversal of 166615065561005 is 500165560516661.

166615065561005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 166615065561005 - 2¹⁰ = 166615065559981 is a prime.

It is a super-2 number, since 2×166615065561005² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 433712705 + ... + 434096694.

It is an arithmetic number, because the mean of its divisors is an integer number (6873050448000).

Almost surely, 2^{166615065561005} is an apocalyptic number.

It is an amenable number.

166615065561005 is a deficient number, since it is larger than the sum of its proper divisors (53322548774995).

166615065561005 is a wasteful number, since it uses less digits than its factorization.

166615065561005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867809513.

The product of its (nonzero) digits is 4860000, while the sum is 53.

The spelling of 166615065561005 in words is "one hundred sixty-six trillion, six hundred fifteen billion, sixty-five million, five hundred sixty-one thousand, five".