65566560651 has 4 divisors (see below), whose sum is σ = 87422080872. Its totient is φ = 43711040432.

The previous prime is 65566560559. The next prime is 65566560673. The reversal of 65566560651 is 15606566556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65566560651 - 2⁹ = 65566560139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65566560594 and 65566560603.

It is not an unprimeable number, because it can be changed into a prime (65566520651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10927760106 + ... + 10927760111.

It is an arithmetic number, because the mean of its divisors is an integer number (21855520218).

Almost surely, 2^65566560651 is an apocalyptic number.

65566560651 is a deficient number, since it is larger than the sum of its proper divisors (21855520221).

65566560651 is a wasteful number, since it uses less digits than its factorization.

65566560651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21855520220.

The product of its (nonzero) digits is 4860000, while the sum is 51.

The spelling of 65566560651 in words is "sixty-five billion, five hundred sixty-six million, five hundred sixty thousand, six hundred fifty-one".