561165512660361 has 48 divisors (see below), whose sum is σ = 929907643392000. Its totient is φ = 319441555081440.

The previous prime is 561165512660353. The next prime is 561165512660369. The reversal of 561165512660361 is 163066215561165.

561165512660361 is a `hidden beast` number, since 5 + 6 + 1 + 1 + 6 + 5 + 5 + 1 + 26 + 603 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (561165512660353) and next prime (561165512660369).

It is not a de Polignac number, because 561165512660361 - 2³ = 561165512660353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561165512660298 and 561165512660307.

It is not an unprimeable number, because it can be changed into a prime (561165512660369) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57885976 + ... + 66881366.

It is an arithmetic number, because the mean of its divisors is an integer number (19373075904000).

Almost surely, 2^{561165512660361} is an apocalyptic number.

It is an amenable number.

561165512660361 is a deficient number, since it is larger than the sum of its proper divisors (368742130731639).

561165512660361 is a wasteful number, since it uses less digits than its factorization.

561165512660361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8999186 (or 8999183 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 54.

The spelling of 561165512660361 in words is "five hundred sixty-one trillion, one hundred sixty-five billion, five hundred twelve million, six hundred sixty thousand, three hundred sixty-one".