640365536544379 has 2 divisors, whose sum is σ = 640365536544380. Its totient is φ = 640365536544378.

The previous prime is 640365536544347. The next prime is 640365536544469. The reversal of 640365536544379 is 973445635563046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640365536544379 - 2⁵ = 640365536544347 is a prime.

It is not a weakly prime, because it can be changed into another prime (640365533544379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320182768272189 + 320182768272190.

It is an arithmetic number, because the mean of its divisors is an integer number (320182768272190).

Almost surely, 2^{640365536544379} is an apocalyptic number.

640365536544379 is a deficient number, since it is larger than the sum of its proper divisors (1).

640365536544379 is an equidigital number, since it uses as much as digits as its factorization.

640365536544379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328000, while the sum is 70.

The spelling of 640365536544379 in words is "six hundred forty trillion, three hundred sixty-five billion, five hundred thirty-six million, five hundred forty-four thousand, three hundred seventy-nine".