6181605161 has 8 divisors (see below), whose sum is σ = 6573814920. Its totient is φ = 5792571648.

The previous prime is 6181605139. The next prime is 6181605173. The reversal of 6181605161 is 1615061816.

It can be written as a sum of positive squares in 4 ways, for example, as 2360016400 + 3821588761 = 48580^2 + 61819^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6181605161 - 2²² = 6177410857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6181605191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 790046 + ... + 797831.

It is an arithmetic number, because the mean of its divisors is an integer number (821726865).

Almost surely, 2^6181605161 is an apocalyptic number.

It is an amenable number.

6181605161 is a deficient number, since it is larger than the sum of its proper divisors (392209759).

6181605161 is a wasteful number, since it uses less digits than its factorization.

6181605161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588123.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 6181605161 is about 78623.1846276911. The cubic root of 6181605161 is about 1835.2719231146.

Adding to 6181605161 its reverse (1615061816), we get a palindrome (7796666977).

The spelling of 6181605161 in words is "six billion, one hundred eighty-one million, six hundred five thousand, one hundred sixty-one".