659565979 has 4 divisors (see below), whose sum is σ = 662471784. Its totient is φ = 656660176.

The previous prime is 659565961. The next prime is 659565989. The reversal of 659565979 is 979565956.

659565979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 659565979 - 2²¹ = 657468827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (659565919) 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, 1452562 + ... + 1453015.

It is an arithmetic number, because the mean of its divisors is an integer number (165617946).

Almost surely, 2^659565979 is an apocalyptic number.

659565979 is a deficient number, since it is larger than the sum of its proper divisors (2905805).

659565979 is a wasteful number, since it uses less digits than its factorization.

659565979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905804.

The product of its digits is 22963500, while the sum is 61.

The square root of 659565979 is about 25682.0166458945. The cubic root of 659565979 is about 870.4678766663.

The spelling of 659565979 in words is "six hundred fifty-nine million, five hundred sixty-five thousand, nine hundred seventy-nine".