66026646686 has 48 divisors (see below), whose sum is σ = 133984187232. Its totient is φ = 23745839040.

The previous prime is 66026646683. The next prime is 66026646691. The reversal of 66026646686 is 68664662066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66026646683) 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, 1477085 + ... + 1521128.

It is an arithmetic number, because the mean of its divisors is an integer number (2791337234).

Almost surely, 2^66026646686 is an apocalyptic number.

66026646686 is an abundant number, since it is smaller than the sum of its proper divisors (67957540546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66026646686 is a wasteful number, since it uses less digits than its factorization.

66026646686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2998257 (or 2998246 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 56.

The spelling of 66026646686 in words is "sixty-six billion, twenty-six million, six hundred forty-six thousand, six hundred eighty-six".