659971505 has 12 divisors (see below), whose sum is σ = 805496436. Its totient is φ = 518968800.

The previous prime is 659971457. The next prime is 659971513. The reversal of 659971505 is 505179956.

It can be written as a sum of positive squares in 2 ways, for example, as 106028209 + 553943296 = 10297^2 + 23536^2 .

It is a de Polignac number, because none of the positive numbers 2^k-659971505 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 659971505.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 447920 + ... + 449390.

It is an arithmetic number, because the mean of its divisors is an integer number (67124703).

Almost surely, 2^659971505 is an apocalyptic number.

It is an amenable number.

659971505 is a deficient number, since it is larger than the sum of its proper divisors (145524931).

659971505 is an frugal number, since it uses more digits than its factorization.

659971505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008 (or 1537 counting only the distinct ones).

The product of its (nonzero) digits is 425250, while the sum is 47.

The square root of 659971505 is about 25689.9105681589. The cubic root of 659971505 is about 870.6462389261.

The spelling of 659971505 in words is "six hundred fifty-nine million, nine hundred seventy-one thousand, five hundred five".