646623285601 has 2 divisors, whose sum is σ = 646623285602. Its totient is φ = 646623285600.

The previous prime is 646623285559. The next prime is 646623285617. The reversal of 646623285601 is 106582326646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529110760000 + 117512525601 = 727400^2 + 342801^2 .

It is a cyclic number.

It is not a de Polignac number, because 646623285601 - 2²⁵ = 646589731169 is a prime.

It is not a weakly prime, because it can be changed into another prime (646623285701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323311642800 + 323311642801.

It is an arithmetic number, because the mean of its divisors is an integer number (323311642801).

Almost surely, 2^646623285601 is an apocalyptic number.

It is an amenable number.

646623285601 is a deficient number, since it is larger than the sum of its proper divisors (1).

646623285601 is an equidigital number, since it uses as much as digits as its factorization.

646623285601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 646623285601 in words is "six hundred forty-six billion, six hundred twenty-three million, two hundred eighty-five thousand, six hundred one".