66056717172117 has 8 divisors (see below), whose sum is σ = 100657854738496. Its totient is φ = 37746695526912.

The previous prime is 66056717172113. The next prime is 66056717172139. The reversal of 66056717172117 is 71127171765066.

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

It is not a de Polignac number, because 66056717172117 - 2² = 66056717172113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66056717172113) 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, 1572778980268 + ... + 1572778980309.

It is an arithmetic number, because the mean of its divisors is an integer number (12582231842312).

Almost surely, 2^{66056717172117} is an apocalyptic number.

It is an amenable number.

66056717172117 is a deficient number, since it is larger than the sum of its proper divisors (34601137566379).

66056717172117 is a wasteful number, since it uses less digits than its factorization.

66056717172117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145557960587.

The product of its (nonzero) digits is 5186160, while the sum is 57.

The spelling of 66056717172117 in words is "sixty-six trillion, fifty-six billion, seven hundred seventeen million, one hundred seventy-two thousand, one hundred seventeen".