5661505165 has 8 divisors (see below), whose sum is σ = 6802086168. Its totient is φ = 4523684160.

The previous prime is 5661505153. The next prime is 5661505181. The reversal of 5661505165 is 5615051665.

It can be written as a sum of positive squares in 4 ways, for example, as 62125924 + 5599379241 = 7882^2 + 74829^2 .

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

It is not a de Polignac number, because 5661505165 - 2⁵ = 5661505133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 685482 + ... + 693691.

It is an arithmetic number, because the mean of its divisors is an integer number (850260771).

Almost surely, 2^5661505165 is an apocalyptic number.

It is an amenable number.

5661505165 is a deficient number, since it is larger than the sum of its proper divisors (1140581003).

5661505165 is a wasteful number, since it uses less digits than its factorization.

5661505165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379999.

The product of its (nonzero) digits is 135000, while the sum is 40.

The square root of 5661505165 is about 75242.9741902857. The cubic root of 5661505165 is about 1782.2856180442.

The spelling of 5661505165 in words is "five billion, six hundred sixty-one million, five hundred five thousand, one hundred sixty-five".