656425001 has 2 divisors, whose sum is σ = 656425002. Its totient is φ = 656425000.

The previous prime is 656424949. The next prime is 656425039. The reversal of 656425001 is 100524656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453647401 + 202777600 = 21299^2 + 14240^2 .

It is a cyclic number.

It is not a de Polignac number, because 656425001 - 2²² = 652230697 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (656425051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328212500 + 328212501.

It is an arithmetic number, because the mean of its divisors is an integer number (328212501).

Almost surely, 2^656425001 is an apocalyptic number.

It is an amenable number.

656425001 is a deficient number, since it is larger than the sum of its proper divisors (1).

656425001 is an equidigital number, since it uses as much as digits as its factorization.

656425001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 656425001 is about 25620.7923569901. The cubic root of 656425001 is about 869.0838998343.

Adding to 656425001 its reverse (100524656), we get a palindrome (756949657).

The spelling of 656425001 in words is "six hundred fifty-six million, four hundred twenty-five thousand, one".