66355336817 has 8 divisors (see below), whose sum is σ = 82728731712. Its totient is φ = 51705457200.

The previous prime is 66355336807. The next prime is 66355336849. The reversal of 66355336817 is 71863355366.

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 66355336817 - 2¹⁴ = 66355320433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66355336807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430878734 + ... + 430878887.

It is an arithmetic number, because the mean of its divisors is an integer number (10341091464).

Almost surely, 2^66355336817 is an apocalyptic number.

It is an amenable number.

66355336817 is a deficient number, since it is larger than the sum of its proper divisors (16373394895).

66355336817 is a wasteful number, since it uses less digits than its factorization.

66355336817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861757639.

The product of its digits is 8164800, while the sum is 53.

The spelling of 66355336817 in words is "sixty-six billion, three hundred fifty-five million, three hundred thirty-six thousand, eight hundred seventeen".