640018346911 has 2 divisors, whose sum is σ = 640018346912. Its totient is φ = 640018346910.

The previous prime is 640018346879. The next prime is 640018346953. The reversal of 640018346911 is 119643810046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640018346911 - 2⁵ = 640018346879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640018346111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320009173455 + 320009173456.

It is an arithmetic number, because the mean of its divisors is an integer number (320009173456).

Almost surely, 2^640018346911 is an apocalyptic number.

640018346911 is a deficient number, since it is larger than the sum of its proper divisors (1).

640018346911 is an equidigital number, since it uses as much as digits as its factorization.

640018346911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 640018346911 in words is "six hundred forty billion, eighteen million, three hundred forty-six thousand, nine hundred eleven".