66598928809 has 8 divisors (see below), whose sum is σ = 76396011840. Its totient is φ = 56872583376.

The previous prime is 66598928807. The next prime is 66598928849. The reversal of 66598928809 is 90882989566.

It is a happy number.

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

It is not a de Polignac number, because 66598928809 - 2¹ = 66598928807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66598928807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17682379 + ... + 17686144.

It is an arithmetic number, because the mean of its divisors is an integer number (9549501480).

Almost surely, 2^66598928809 is an apocalyptic number.

It is an amenable number.

66598928809 is a deficient number, since it is larger than the sum of its proper divisors (9797083031).

66598928809 is a wasteful number, since it uses less digits than its factorization.

66598928809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35368799.

The product of its (nonzero) digits is 134369280, while the sum is 70.

The spelling of 66598928809 in words is "sixty-six billion, five hundred ninety-eight million, nine hundred twenty-eight thousand, eight hundred nine".