66686026668280 has 64 divisors (see below), whose sum is σ = 154957729104000. Its totient is φ = 25813534331904.

The previous prime is 66686026668253. The next prime is 66686026668307. The reversal of 66686026668280 is 8286662068666.

It is an interprime number because it is at equal distance from previous prime (66686026668253) and next prime (66686026668307).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199109595 + ... + 199444234.

It is an arithmetic number, because the mean of its divisors is an integer number (2421214517250).

Almost surely, 2^{66686026668280} is an apocalyptic number.

It is an amenable number.

66686026668280 is an abundant number, since it is smaller than the sum of its proper divisors (88271702435720).

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

66686026668280 is a wasteful number, since it uses less digits than its factorization.

66686026668280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398553976 (or 398553972 counting only the distinct ones).

The product of its (nonzero) digits is 573308928, while the sum is 70.

The spelling of 66686026668280 in words is "sixty-six trillion, six hundred eighty-six billion, twenty-six million, six hundred sixty-eight thousand, two hundred eighty".