66608260689 has 16 divisors (see below), whose sum is σ = 95069779200. Its totient is φ = 41355349776.

The previous prime is 66608260679. The next prime is 66608260721. The reversal of 66608260689 is 98606280666.

It is not a de Polignac number, because 66608260689 - 2⁹ = 66608260177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (66608260679) 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, 9899739 + ... + 9906464.

It is an arithmetic number, because the mean of its divisors is an integer number (5941861200).

Almost surely, 2^66608260689 is an apocalyptic number.

It is an amenable number.

66608260689 is a deficient number, since it is larger than the sum of its proper divisors (28461518511).

66608260689 is a wasteful number, since it uses less digits than its factorization.

66608260689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19806284.

The product of its (nonzero) digits is 8957952, while the sum is 57.

The spelling of 66608260689 in words is "sixty-six billion, six hundred eight million, two hundred sixty thousand, six hundred eighty-nine".