65565355691 has 16 divisors (see below), whose sum is σ = 71712442368. Its totient is φ = 59449569600.

The previous prime is 65565355679. The next prime is 65565355711. The reversal of 65565355691 is 19655356556.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65565355691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65565355391) 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, 7961546 + ... + 7969776.

It is an arithmetic number, because the mean of its divisors is an integer number (4482027648).

Almost surely, 2^65565355691 is an apocalyptic number.

65565355691 is a deficient number, since it is larger than the sum of its proper divisors (6147086677).

65565355691 is a wasteful number, since it uses less digits than its factorization.

65565355691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10042.

The product of its digits is 18225000, while the sum is 56.

The spelling of 65565355691 in words is "sixty-five billion, five hundred sixty-five million, three hundred fifty-five thousand, six hundred ninety-one".