656000001 has 6 divisors (see below), whose sum is σ = 947555570. Its totient is φ = 437333328.

The previous prime is 655999999. The next prime is 656000003. The reversal of 656000001 is 100000656.

656000001 is a `hidden beast` number, since 65 + 600 + 0 + 0 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (655999999) and next prime (656000003).

It can be written as a sum of positive squares in only one way, i.e., 335768976 + 320231025 = 18324^2 + 17895^2 .

It is not a de Polignac number, because 656000001 - 2¹ = 655999999 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (656000003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36444436 + ... + 36444453.

Almost surely, 2^656000001 is an apocalyptic number.

It is an amenable number.

656000001 is a deficient number, since it is larger than the sum of its proper divisors (291555569).

656000001 is a wasteful number, since it uses less digits than its factorization.

656000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72888895 (or 72888892 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 656000001 is about 25612.4969692531. The cubic root of 656000001 is about 868.8962975952.

Adding to 656000001 its reverse (100000656), we get a palindrome (756000657).

The spelling of 656000001 in words is "six hundred fifty-six million, one", and thus it is an aban number.