655564801 has 2 divisors, whose sum is σ = 655564802. Its totient is φ = 655564800.

The previous prime is 655564769. The next prime is 655564849. The reversal of 655564801 is 108465556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501804801 + 153760000 = 22401^2 + 12400^2 .

It is a cyclic number.

It is not a de Polignac number, because 655564801 - 2⁵ = 655564769 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (655564891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327782400 + 327782401.

It is an arithmetic number, because the mean of its divisors is an integer number (327782401).

Almost surely, 2^655564801 is an apocalyptic number.

It is an amenable number.

655564801 is a deficient number, since it is larger than the sum of its proper divisors (1).

655564801 is an equidigital number, since it uses as much as digits as its factorization.

655564801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 40.

The square root of 655564801 is about 25603.9997070770. Note that the first 3 decimals coincide. The cubic root of 655564801 is about 868.7041089159.

The spelling of 655564801 in words is "six hundred fifty-five million, five hundred sixty-four thousand, eight hundred one".