66426286868 has 6 divisors (see below), whose sum is σ = 116246002026. Its totient is φ = 33213143432.

The previous prime is 66426286853. The next prime is 66426286889. The reversal of 66426286868 is 86868262466.

It can be written as a sum of positive squares in only one way, i.e., 66042832144 + 383454724 = 256988^2 + 19582^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66426286868.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8303285855 + ... + 8303285862.

It is an arithmetic number, because the mean of its divisors is an integer number (19374333671).

Almost surely, 2^66426286868 is an apocalyptic number.

It is an amenable number.

66426286868 is a deficient number, since it is larger than the sum of its proper divisors (49819715158).

66426286868 is a wasteful number, since it uses less digits than its factorization.

66426286868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16606571721 (or 16606571719 counting only the distinct ones).

The product of its digits is 63700992, while the sum is 62.

The spelling of 66426286868 in words is "sixty-six billion, four hundred twenty-six million, two hundred eighty-six thousand, eight hundred sixty-eight".