66509557117267 has 8 divisors (see below), whose sum is σ = 76823873461872. Its totient is φ = 56906572934400.

The previous prime is 66509557117259. The next prime is 66509557117277. The reversal of 66509557117267 is 76271175590566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66509557117267 - 2³ = 66509557117259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66509557117277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177833040234 + ... + 177833040607.

It is an arithmetic number, because the mean of its divisors is an integer number (9602984182734).

Almost surely, 2^{66509557117267} is an apocalyptic number.

66509557117267 is a deficient number, since it is larger than the sum of its proper divisors (10314316344605).

66509557117267 is a wasteful number, since it uses less digits than its factorization.

66509557117267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355666080869.

The product of its (nonzero) digits is 166698000, while the sum is 67.

The spelling of 66509557117267 in words is "sixty-six trillion, five hundred nine billion, five hundred fifty-seven million, one hundred seventeen thousand, two hundred sixty-seven".