161600665101111 has 24 divisors (see below), whose sum is σ = 240969379462656. Its totient is φ = 104251390344720.

The previous prime is 161600665101091. The next prime is 161600665101167. The reversal of 161600665101111 is 111101566006161.

It is a happy number.

161600665101111 is a `hidden beast` number, since 1 + 6 + 1 + 60 + 0 + 66 + 510 + 11 + 11 = 666.

It is not a de Polignac number, because 161600665101111 - 2¹⁰ = 161600665100087 is a prime.

It is a super-2 number, since 2×161600665101111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161600665101311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15627405 + ... + 23820518.

It is an arithmetic number, because the mean of its divisors is an integer number (10040390810944).

Almost surely, 2^{161600665101111} is an apocalyptic number.

161600665101111 is a deficient number, since it is larger than the sum of its proper divisors (79368714361545).

161600665101111 is a wasteful number, since it uses less digits than its factorization.

161600665101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39462643 (or 39462640 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The spelling of 161600665101111 in words is "one hundred sixty-one trillion, six hundred billion, six hundred sixty-five million, one hundred one thousand, one hundred eleven".