659685623 has 2 divisors, whose sum is σ = 659685624. Its totient is φ = 659685622.

The previous prime is 659685619. The next prime is 659685671. The reversal of 659685623 is 326586956.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 659685623 - 2² = 659685619 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (659685683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329842811 + 329842812.

It is an arithmetic number, because the mean of its divisors is an integer number (329842812).

Almost surely, 2^659685623 is an apocalyptic number.

659685623 is a deficient number, since it is larger than the sum of its proper divisors (1).

659685623 is an equidigital number, since it uses as much as digits as its factorization.

659685623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 50.

The square root of 659685623 is about 25684.3458744816. The cubic root of 659685623 is about 870.5205072169.

The spelling of 659685623 in words is "six hundred fifty-nine million, six hundred eighty-five thousand, six hundred twenty-three".