659561857921 has 8 divisors (see below), whose sum is σ = 672459641280. Its totient is φ = 646680860592.

The previous prime is 659561857907. The next prime is 659561857961. The reversal of 659561857921 is 129758165956.

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 659561857921 - 2¹⁹ = 659561333633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (659561857961) 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, 4117141 + ... + 4274338.

It is an arithmetic number, because the mean of its divisors is an integer number (84057455160).

Almost surely, 2^659561857921 is an apocalyptic number.

It is an amenable number.

659561857921 is a deficient number, since it is larger than the sum of its proper divisors (12897783359).

659561857921 is a wasteful number, since it uses less digits than its factorization.

659561857921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8393015.

The product of its digits is 40824000, while the sum is 64.

The spelling of 659561857921 in words is "six hundred fifty-nine billion, five hundred sixty-one million, eight hundred fifty-seven thousand, nine hundred twenty-one".