66758407027517 has 8 divisors (see below), whose sum is σ = 69679637442816. Its totient is φ = 63838734193872.

The previous prime is 66758407027489. The next prime is 66758407027531. The reversal of 66758407027517 is 71572070485766.

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

It is not a de Polignac number, because 66758407027517 - 2²⁶ = 66758339918653 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 (66758407027547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389307818 + ... + 389479259.

It is an arithmetic number, because the mean of its divisors is an integer number (8709954680352).

Almost surely, 2^{66758407027517} is an apocalyptic number.

It is an amenable number.

66758407027517 is a deficient number, since it is larger than the sum of its proper divisors (2921230415299).

66758407027517 is a wasteful number, since it uses less digits than its factorization.

66758407027517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778790827.

The product of its (nonzero) digits is 138297600, while the sum is 65.

The spelling of 66758407027517 in words is "sixty-six trillion, seven hundred fifty-eight billion, four hundred seven million, twenty-seven thousand, five hundred seventeen".