66535805195 has 4 divisors (see below), whose sum is σ = 79842966240. Its totient is φ = 53228644152.

The previous prime is 66535805183. The next prime is 66535805221. The reversal of 66535805195 is 59150853566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66535805195 - 2⁶ = 66535805131 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6653580515 + ... + 6653580524.

It is an arithmetic number, because the mean of its divisors is an integer number (19960741560).

Almost surely, 2^66535805195 is an apocalyptic number.

66535805195 is a deficient number, since it is larger than the sum of its proper divisors (13307161045).

66535805195 is a wasteful number, since it uses less digits than its factorization.

66535805195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13307161044.

The product of its (nonzero) digits is 4860000, while the sum is 53.

The spelling of 66535805195 in words is "sixty-six billion, five hundred thirty-five million, eight hundred five thousand, one hundred ninety-five".