10565665538 has 8 divisors (see below), whose sum is σ = 15854525388. Its totient is φ = 5280823744.

The previous prime is 10565665477. The next prime is 10565665541. The reversal of 10565665538 is 83556656501.

It can be written as a sum of positive squares in 2 ways, for example, as 8254267609 + 2311397929 = 90853^2 + 48077^2 .

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

It is a super-2 number, since 2×10565665538² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997931 + ... + 1008462.

Almost surely, 2^10565665538 is an apocalyptic number.

10565665538 is a deficient number, since it is larger than the sum of its proper divisors (5288859850).

10565665538 is a wasteful number, since it uses less digits than its factorization.

10565665538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009028.

The product of its (nonzero) digits is 3240000, while the sum is 50.

The spelling of 10565665538 in words is "ten billion, five hundred sixty-five million, six hundred sixty-five thousand, five hundred thirty-eight".