659685649 has 16 divisors (see below), whose sum is σ = 783244800. Its totient is φ = 543622464.

The previous prime is 659685623. The next prime is 659685671. The reversal of 659685649 is 946586956.

It is not a de Polignac number, because 659685649 - 2⁹ = 659685137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 659685593 and 659685602.

It is not an unprimeable number, because it can be changed into a prime (659685619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41719 + ... + 55315.

It is an arithmetic number, because the mean of its divisors is an integer number (48952800).

Almost surely, 2^659685649 is an apocalyptic number.

It is an amenable number.

659685649 is a deficient number, since it is larger than the sum of its proper divisors (123559151).

659685649 is a wasteful number, since it uses less digits than its factorization.

659685649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13872.

The product of its digits is 13996800, while the sum is 58.

The square root of 659685649 is about 25684.3463806265. The cubic root of 659685649 is about 870.5205186535.

It can be divided in two parts, 65968 and 5649, that added together give a palindrome (71617).

The spelling of 659685649 in words is "six hundred fifty-nine million, six hundred eighty-five thousand, six hundred forty-nine".