6165439561 has 16 divisors (see below), whose sum is σ = 6550992000. Its totient is φ = 5786208000.

The previous prime is 6165439559. The next prime is 6165439603. The reversal of 6165439561 is 1659345616.

It is a cyclic number.

It is not a de Polignac number, because 6165439561 - 2¹ = 6165439559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6165439531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1132516 + ... + 1137946.

It is an arithmetic number, because the mean of its divisors is an integer number (409437000).

Almost surely, 2^6165439561 is an apocalyptic number.

It is an amenable number.

6165439561 is a deficient number, since it is larger than the sum of its proper divisors (385552439).

6165439561 is a wasteful number, since it uses less digits than its factorization.

6165439561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6000.

The product of its digits is 583200, while the sum is 46.

The square root of 6165439561 is about 78520.3130470071. The cubic root of 6165439561 is about 1833.6707116367.

The spelling of 6165439561 in words is "six billion, one hundred sixty-five million, four hundred thirty-nine thousand, five hundred sixty-one".