6161661605 has 8 divisors (see below), whose sum is σ = 8066175264. Its totient is φ = 4481208400.

The previous prime is 6161661599. The next prime is 6161661607. The reversal of 6161661605 is 5061661616.

It is a happy number.

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

It is not a de Polignac number, because 6161661605 - 2²² = 6157467301 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6161661607) 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, 56015051 + ... + 56015160.

It is an arithmetic number, because the mean of its divisors is an integer number (1008271908).

Almost surely, 2^6161661605 is an apocalyptic number.

It is an amenable number.

6161661605 is a deficient number, since it is larger than the sum of its proper divisors (1904513659).

6161661605 is a wasteful number, since it uses less digits than its factorization.

6161661605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112030227.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 6161661605 is about 78496.2521716801. The cubic root of 6161661605 is about 1833.2960996479.

It can be divided in two parts, 6161 and 661605, that added together give a palindrome (667766).

The spelling of 6161661605 in words is "six billion, one hundred sixty-one million, six hundred sixty-one thousand, six hundred five".