640043358767 has 2 divisors, whose sum is σ = 640043358768. Its totient is φ = 640043358766.

The previous prime is 640043358733. The next prime is 640043358781. The reversal of 640043358767 is 767853340046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640043358767 - 2¹⁴ = 640043342383 is a prime.

It is a super-2 number, since 2×640043358767² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640043351767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320021679383 + 320021679384.

It is an arithmetic number, because the mean of its divisors is an integer number (320021679384).

Almost surely, 2^640043358767 is an apocalyptic number.

640043358767 is a deficient number, since it is larger than the sum of its proper divisors (1).

640043358767 is an equidigital number, since it uses as much as digits as its factorization.

640043358767 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10160640, while the sum is 53.

The spelling of 640043358767 in words is "six hundred forty billion, forty-three million, three hundred fifty-eight thousand, seven hundred sixty-seven".