659979647 has 4 divisors (see below), whose sum is σ = 660037656. Its totient is φ = 659921640.

The previous prime is 659979637. The next prime is 659979653. The reversal of 659979647 is 746979956.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 659979647 - 2⁸ = 659979391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 659979647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659979637) 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, 5693 + ... + 36774.

It is an arithmetic number, because the mean of its divisors is an integer number (165009414).

Almost surely, 2^659979647 is an apocalyptic number.

659979647 is a deficient number, since it is larger than the sum of its proper divisors (58009).

659979647 is a wasteful number, since it uses less digits than its factorization.

659979647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58008.

The product of its digits is 25719120, while the sum is 62.

The square root of 659979647 is about 25690.0690345511. The cubic root of 659979647 is about 870.6498192688.

The spelling of 659979647 in words is "six hundred fifty-nine million, nine hundred seventy-nine thousand, six hundred forty-seven".