6555551611565 has 32 divisors (see below), whose sum is σ = 8616318492672. Its totient is φ = 4748512104000.

The previous prime is 6555551611489. The next prime is 6555551611577. The reversal of 6555551611565 is 5651161555556.

It is not a de Polignac number, because 6555551611565 - 2²⁴ = 6555534834349 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 6555551611565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69833510 + ... + 69927320.

It is an arithmetic number, because the mean of its divisors is an integer number (269259952896).

Almost surely, 2^{6555551611565} is an apocalyptic number.

It is an amenable number.

6555551611565 is a deficient number, since it is larger than the sum of its proper divisors (2060766881107).

6555551611565 is a wasteful number, since it uses less digits than its factorization.

6555551611565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98921.

The product of its digits is 16875000, while the sum is 56.

The spelling of 6555551611565 in words is "six trillion, five hundred fifty-five billion, five hundred fifty-one million, six hundred eleven thousand, five hundred sixty-five".