65566066555 has 64 divisors (see below), whose sum is σ = 91122941952. Its totient is φ = 44841600000.

The previous prime is 65566066549. The next prime is 65566066583. The reversal of 65566066555 is 55566066556.

It is not a de Polignac number, because 65566066555 - 2¹¹ = 65566064507 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65566066496 and 65566066505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18942525 + ... + 18945985.

It is an arithmetic number, because the mean of its divisors is an integer number (1423795968).

Almost surely, 2^65566066555 is an apocalyptic number.

65566066555 is a deficient number, since it is larger than the sum of its proper divisors (25556875397).

65566066555 is a wasteful number, since it uses less digits than its factorization.

65566066555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3820.

The product of its (nonzero) digits is 24300000, while the sum is 55.

Subtracting from 65566066555 its reverse (55566066556), we obtain a palindrome (9999999999).

The spelling of 65566066555 in words is "sixty-five billion, five hundred sixty-six million, sixty-six thousand, five hundred fifty-five".