659979138559 has 4 divisors (see below), whose sum is σ = 710746764616. Its totient is φ = 609211512504.

The previous prime is 659979138509. The next prime is 659979138587. The reversal of 659979138559 is 955831979956.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 659979138559 - 2⁷ = 659979138431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659979138509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25383813009 + ... + 25383813034.

It is an arithmetic number, because the mean of its divisors is an integer number (177686691154).

Almost surely, 2^659979138559 is an apocalyptic number.

659979138559 is a deficient number, since it is larger than the sum of its proper divisors (50767626057).

659979138559 is a wasteful number, since it uses less digits than its factorization.

659979138559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50767626056.

The product of its digits is 826686000, while the sum is 76.

The spelling of 659979138559 in words is "six hundred fifty-nine billion, nine hundred seventy-nine million, one hundred thirty-eight thousand, five hundred fifty-nine".