640508446241 has 2 divisors, whose sum is σ = 640508446242. Its totient is φ = 640508446240.

The previous prime is 640508446213. The next prime is 640508446261. The reversal of 640508446241 is 142644805046.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549964627216 + 90543819025 = 741596^2 + 300905^2 .

It is a cyclic number.

It is not a de Polignac number, because 640508446241 - 2⁶ = 640508446177 is a prime.

It is a super-3 number, since 3×640508446241³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640508446192 and 640508446201.

It is not a weakly prime, because it can be changed into another prime (640508446261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320254223120 + 320254223121.

It is an arithmetic number, because the mean of its divisors is an integer number (320254223121).

Almost surely, 2^640508446241 is an apocalyptic number.

It is an amenable number.

640508446241 is a deficient number, since it is larger than the sum of its proper divisors (1).

640508446241 is an equidigital number, since it uses as much as digits as its factorization.

640508446241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 737280, while the sum is 44.

The spelling of 640508446241 in words is "six hundred forty billion, five hundred eight million, four hundred forty-six thousand, two hundred forty-one".