66191667275 has 6 divisors (see below), whose sum is σ = 82077667452. Its totient is φ = 52953333800.

The previous prime is 66191667247. The next prime is 66191667319. The reversal of 66191667275 is 57276619166.

66191667275 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66191667275 - 2⁸ = 66191667019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66191667275.

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, 1323833321 + ... + 1323833370.

It is an arithmetic number, because the mean of its divisors is an integer number (13679611242).

Almost surely, 2^66191667275 is an apocalyptic number.

66191667275 is a deficient number, since it is larger than the sum of its proper divisors (15886000177).

66191667275 is a wasteful number, since it uses less digits than its factorization.

66191667275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647666701 (or 2647666696 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 56.

The spelling of 66191667275 in words is "sixty-six billion, one hundred ninety-one million, six hundred sixty-seven thousand, two hundred seventy-five".