666608880601 has 8 divisors (see below), whose sum is σ = 684705003840. Its totient is φ = 648630647952.

The previous prime is 666608880599. The next prime is 666608880629. The reversal of 666608880601 is 106088806666.

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 666608880601 - 2¹ = 666608880599 is a prime.

It is a super-2 number, since 2×666608880601² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666608880001) 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, 29461186 + ... + 29483803.

It is an arithmetic number, because the mean of its divisors is an integer number (85588125480).

Almost surely, 2^666608880601 is an apocalyptic number.

It is an amenable number.

666608880601 is a deficient number, since it is larger than the sum of its proper divisors (18096123239).

666608880601 is a wasteful number, since it uses less digits than its factorization.

666608880601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58945295.

The product of its (nonzero) digits is 3981312, while the sum is 55.

The spelling of 666608880601 in words is "six hundred sixty-six billion, six hundred eight million, eight hundred eighty thousand, six hundred one".