640052267609 has 2 divisors, whose sum is σ = 640052267610. Its totient is φ = 640052267608.

The previous prime is 640052267599. The next prime is 640052267653. The reversal of 640052267609 is 906762250046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 552167886400 + 87884381209 = 743080^2 + 296453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640052267609 is a prime.

It is not a weakly prime, because it can be changed into another prime (640052267009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320026133804 + 320026133805.

It is an arithmetic number, because the mean of its divisors is an integer number (320026133805).

Almost surely, 2^640052267609 is an apocalyptic number.

It is an amenable number.

640052267609 is a deficient number, since it is larger than the sum of its proper divisors (1).

640052267609 is an equidigital number, since it uses as much as digits as its factorization.

640052267609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 640052267609 in words is "six hundred forty billion, fifty-two million, two hundred sixty-seven thousand, six hundred nine".