5665566520261 has 8 divisors (see below), whose sum is σ = 5850506587904. Its totient is φ = 5480762693760.

The previous prime is 5665566520259. The next prime is 5665566520283. The reversal of 5665566520261 is 1620256655665.

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

It is a cyclic number.

It is not a de Polignac number, because 5665566520261 - 2¹ = 5665566520259 is a prime.

It is a super-2 number, since 2×5665566520261² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5665566550261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33975756 + ... + 34142101.

It is an arithmetic number, because the mean of its divisors is an integer number (731313323488).

Almost surely, 2^{5665566520261} is an apocalyptic number.

It is an amenable number.

5665566520261 is a deficient number, since it is larger than the sum of its proper divisors (184940067643).

5665566520261 is a wasteful number, since it uses less digits than its factorization.

5665566520261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68120571.

The product of its (nonzero) digits is 19440000, while the sum is 55.

The spelling of 5665566520261 in words is "five trillion, six hundred sixty-five billion, five hundred sixty-six million, five hundred twenty thousand, two hundred sixty-one".