66500676657 has 24 divisors (see below), whose sum is σ = 96977593440. Its totient is φ = 43908880320.

The previous prime is 66500676631. The next prime is 66500676691. The reversal of 66500676657 is 75667600566.

66500676657 is a `hidden beast` number, since 6 + 6 + 500 + 6 + 76 + 65 + 7 = 666.

It is not a de Polignac number, because 66500676657 - 2¹¹ = 66500674609 is a prime.

It is a super-6 number, since 6×66500676657⁶ (a number of 66 digits) contains 666666 as substring.

It is not an unprimeable number, because it can be changed into a prime (66500676617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7980069 + ... + 7988397.

It is an arithmetic number, because the mean of its divisors is an integer number (4040733060).

Almost surely, 2^66500676657 is an apocalyptic number.

It is an amenable number.

66500676657 is a deficient number, since it is larger than the sum of its proper divisors (30476916783).

66500676657 is a wasteful number, since it uses less digits than its factorization.

66500676657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16733 (or 16730 counting only the distinct ones).

The product of its (nonzero) digits is 9525600, while the sum is 54.

The spelling of 66500676657 in words is "sixty-six billion, five hundred million, six hundred seventy-six thousand, six hundred fifty-seven".