161611100500605 has 32 divisors (see below), whose sum is σ = 312900819796224. Its totient is φ = 69533515508736.

The previous prime is 161611100500579. The next prime is 161611100500621. The reversal of 161611100500605 is 506005001116161.

161611100500605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161611100500605 - 2¹⁴ = 161611100484221 is a prime.

It is a super-2 number, since 2×161611100500605² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

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, 45269214042 + ... + 45269217611.

It is an arithmetic number, because the mean of its divisors is an integer number (9778150618632).

Almost surely, 2^{161611100500605} is an apocalyptic number.

161611100500605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161611100500605 is a deficient number, since it is larger than the sum of its proper divisors (151289719295619).

161611100500605 is a wasteful number, since it uses less digits than its factorization.

161611100500605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90538431685.

The product of its (nonzero) digits is 5400, while the sum is 33.

Adding to 161611100500605 its reverse (506005001116161), we get a palindrome (667616101616766).

The spelling of 161611100500605 in words is "one hundred sixty-one trillion, six hundred eleven billion, one hundred million, five hundred thousand, six hundred five".