640680441301 has 2 divisors, whose sum is σ = 640680441302. Its totient is φ = 640680441300.

The previous prime is 640680441293. The next prime is 640680441353. The reversal of 640680441301 is 103144086046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524943720900 + 115736720401 = 724530^2 + 340201^2 .

It is a cyclic number.

It is not a de Polignac number, because 640680441301 - 2³ = 640680441293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640680441601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320340220650 + 320340220651.

It is an arithmetic number, because the mean of its divisors is an integer number (320340220651).

Almost surely, 2^640680441301 is an apocalyptic number.

It is an amenable number.

640680441301 is a deficient number, since it is larger than the sum of its proper divisors (1).

640680441301 is an equidigital number, since it uses as much as digits as its factorization.

640680441301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 640680441301 in words is "six hundred forty billion, six hundred eighty million, four hundred forty-one thousand, three hundred one".