66224651857 has 8 divisors (see below), whose sum is σ = 81507263936. Its totient is φ = 52397526672.

The previous prime is 66224651827. The next prime is 66224651879. The reversal of 66224651857 is 75815642266.

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 66224651857 - 2⁷ = 66224651729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66224651827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363871623 + ... + 363871804.

It is an arithmetic number, because the mean of its divisors is an integer number (10188407992).

Almost surely, 2^66224651857 is an apocalyptic number.

It is an amenable number.

66224651857 is a deficient number, since it is larger than the sum of its proper divisors (15282612079).

66224651857 is a wasteful number, since it uses less digits than its factorization.

66224651857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727743447.

The product of its digits is 4838400, while the sum is 52.

The spelling of 66224651857 in words is "sixty-six billion, two hundred twenty-four million, six hundred fifty-one thousand, eight hundred fifty-seven".