640265463293 has 2 divisors, whose sum is σ = 640265463294. Its totient is φ = 640265463292.

The previous prime is 640265463269. The next prime is 640265463319. The reversal of 640265463293 is 392364562046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 536721807769 + 103543655524 = 732613^2 + 321782^2 .

It is a cyclic number.

It is not a de Polignac number, because 640265463293 - 2⁸ = 640265463037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640265463493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320132731646 + 320132731647.

It is an arithmetic number, because the mean of its divisors is an integer number (320132731647).

Almost surely, 2^640265463293 is an apocalyptic number.

It is an amenable number.

640265463293 is a deficient number, since it is larger than the sum of its proper divisors (1).

640265463293 is an equidigital number, since it uses as much as digits as its factorization.

640265463293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 50.

The spelling of 640265463293 in words is "six hundred forty billion, two hundred sixty-five million, four hundred sixty-three thousand, two hundred ninety-three".