664560558861 has 8 divisors (see below), whose sum is σ = 932716573920. Its totient is φ = 419722458192.

The previous prime is 664560558763. The next prime is 664560558887. The reversal of 664560558861 is 168855065466.

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

It is not a de Polignac number, because 664560558861 - 2⁷ = 664560558733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664560558795 and 664560558804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664560558161) 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, 5829478530 + ... + 5829478643.

It is an arithmetic number, because the mean of its divisors is an integer number (116589571740).

Almost surely, 2^664560558861 is an apocalyptic number.

It is an amenable number.

664560558861 is a deficient number, since it is larger than the sum of its proper divisors (268156015059).

664560558861 is a wasteful number, since it uses less digits than its factorization.

664560558861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11658957195.

The product of its (nonzero) digits is 41472000, while the sum is 60.

The spelling of 664560558861 in words is "six hundred sixty-four billion, five hundred sixty million, five hundred fifty-eight thousand, eight hundred sixty-one".