66717643507055 has 8 divisors (see below), whose sum is σ = 82821902284800. Its totient is φ = 51533628088096.

The previous prime is 66717643507043. The next prime is 66717643507061. The reversal of 66717643507055 is 55070534671766.

It is a happy number.

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 66717643507055 - 2⁸ = 66717643506799 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230060839535 + ... + 230060839824.

It is an arithmetic number, because the mean of its divisors is an integer number (10352737785600).

Almost surely, 2^{66717643507055} is an apocalyptic number.

66717643507055 is a deficient number, since it is larger than the sum of its proper divisors (16104258777745).

66717643507055 is a wasteful number, since it uses less digits than its factorization.

66717643507055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460121679393.

The product of its (nonzero) digits is 111132000, while the sum is 62.

The spelling of 66717643507055 in words is "sixty-six trillion, seven hundred seventeen billion, six hundred forty-three million, five hundred seven thousand, fifty-five".