66641513417 has 8 divisors (see below), whose sum is σ = 67060665672. Its totient is φ = 66222921600.

The previous prime is 66641513399. The next prime is 66641513429. The reversal of 66641513417 is 71431514666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6741887881 + 59899625536 = 82109^2 + 244744^2 .

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 66641513417 - 2¹⁴ = 66641497033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66647513417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99743 + ... + 378459.

It is an arithmetic number, because the mean of its divisors is an integer number (8382583209).

Almost surely, 2^66641513417 is an apocalyptic number.

It is an amenable number.

66641513417 is a deficient number, since it is larger than the sum of its proper divisors (419152255).

66641513417 is a wasteful number, since it uses less digits than its factorization.

66641513417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280219.

The product of its digits is 362880, while the sum is 44.

The spelling of 66641513417 in words is "sixty-six billion, six hundred forty-one million, five hundred thirteen thousand, four hundred seventeen".