66689266298666 has 12 divisors (see below), whose sum is σ = 109954616749026. Its totient is φ = 30313302862920.

The previous prime is 66689266298653. The next prime is 66689266298693.

66689266298666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 65993218151641 + 696048147025 = 8123621^2 + 834295^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 137787740045 + ... + 137787740528.

Almost surely, 2^{66689266298666} is an apocalyptic number.

66689266298666 is a deficient number, since it is larger than the sum of its proper divisors (43265350450360).

66689266298666 is a wasteful number, since it uses less digits than its factorization.

66689266298666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275575480597 (or 275575480586 counting only the distinct ones).

The product of its digits is 34828517376, while the sum is 86.

The spelling of 66689266298666 in words is "sixty-six trillion, six hundred eighty-nine billion, two hundred sixty-six million, two hundred ninety-eight thousand, six hundred sixty-six".