5665661610065 has 16 divisors (see below), whose sum is σ = 6844070664576. Its totient is φ = 4502347008000.

The previous prime is 5665661609989. The next prime is 5665661610067. The reversal of 5665661610065 is 5600161665665.

It is a happy number.

It is not a de Polignac number, because 5665661610065 - 2¹⁸ = 5665661347921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5665661609989 and 5665661610016.

It is not an unprimeable number, because it can be changed into a prime (5665661610067) 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, 22975070 + ... + 23220360.

It is an arithmetic number, because the mean of its divisors is an integer number (427754416536).

Almost surely, 2^{5665661610065} is an apocalyptic number.

It is an amenable number.

5665661610065 is a deficient number, since it is larger than the sum of its proper divisors (1178409054511).

5665661610065 is a wasteful number, since it uses less digits than its factorization.

5665661610065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276040.

The product of its (nonzero) digits is 5832000, while the sum is 53.

It can be divided in two parts, 5665661 and 610065, that added together give a palindrome (6275726).

The spelling of 5665661610065 in words is "five trillion, six hundred sixty-five billion, six hundred sixty-one million, six hundred ten thousand, sixty-five".