656320001 has 2 divisors, whose sum is σ = 656320002. Its totient is φ = 656320000.

The previous prime is 656319943. The next prime is 656320013. The reversal of 656320001 is 100023656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368678401 + 287641600 = 19201^2 + 16960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656320001 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (656320031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328160000 + 328160001.

It is an arithmetic number, because the mean of its divisors is an integer number (328160001).

Almost surely, 2^656320001 is an apocalyptic number.

It is an amenable number.

656320001 is a deficient number, since it is larger than the sum of its proper divisors (1).

656320001 is an equidigital number, since it uses as much as digits as its factorization.

656320001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 656320001 is about 25618.7431580864. The cubic root of 656320001 is about 869.0375585791.

Adding to 656320001 its reverse (100023656), we get a palindrome (756343657).

The spelling of 656320001 in words is "six hundred fifty-six million, three hundred twenty thousand, one".