655638559 has 2 divisors, whose sum is σ = 655638560. Its totient is φ = 655638558.

The previous prime is 655638551. The next prime is 655638601. The reversal of 655638559 is 955836556.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655638559 - 2³ = 655638551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655638551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327819279 + 327819280.

It is an arithmetic number, because the mean of its divisors is an integer number (327819280).

Almost surely, 2^655638559 is an apocalyptic number.

655638559 is a deficient number, since it is larger than the sum of its proper divisors (1).

655638559 is an equidigital number, since it uses as much as digits as its factorization.

655638559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860000, while the sum is 52.

The square root of 655638559 is about 25605.4400274629. The cubic root of 655638559 is about 868.7366871724.

The spelling of 655638559 in words is "six hundred fifty-five million, six hundred thirty-eight thousand, five hundred fifty-nine".