66511606651 has 8 divisors (see below), whose sum is σ = 76045865184. Its totient is φ = 56985498240.

The previous prime is 66511606643. The next prime is 66511606687. The reversal of 66511606651 is 15660611566.

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 66511606651 - 2³ = 66511606643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66511606598 and 66511606607.

It is not an unprimeable number, because it can be changed into a prime (66511606631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2020030 + ... + 2052691.

It is an arithmetic number, because the mean of its divisors is an integer number (9505733148).

Almost surely, 2^66511606651 is an apocalyptic number.

66511606651 is a deficient number, since it is larger than the sum of its proper divisors (9534258533).

66511606651 is a wasteful number, since it uses less digits than its factorization.

66511606651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075061.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 66511606651 in words is "sixty-six billion, five hundred eleven million, six hundred six thousand, six hundred fifty-one".