640043358679 has 2 divisors, whose sum is σ = 640043358680. Its totient is φ = 640043358678.

The previous prime is 640043358641. The next prime is 640043358709. The reversal of 640043358679 is 976853340046.

640043358679 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640043358679 - 2¹³ = 640043350487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640043358629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320021679339 + 320021679340.

It is an arithmetic number, because the mean of its divisors is an integer number (320021679340).

Almost surely, 2^640043358679 is an apocalyptic number.

640043358679 is a deficient number, since it is larger than the sum of its proper divisors (1).

640043358679 is an equidigital number, since it uses as much as digits as its factorization.

640043358679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13063680, while the sum is 55.

The spelling of 640043358679 in words is "six hundred forty billion, forty-three million, three hundred fifty-eight thousand, six hundred seventy-nine".