640946945711 has 2 divisors, whose sum is σ = 640946945712. Its totient is φ = 640946945710.

The previous prime is 640946945701. The next prime is 640946945759. The reversal of 640946945711 is 117549649046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640946945711 - 2¹⁴ = 640946929327 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640946945701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320473472855 + 320473472856.

It is an arithmetic number, because the mean of its divisors is an integer number (320473472856).

Almost surely, 2^640946945711 is an apocalyptic number.

640946945711 is a deficient number, since it is larger than the sum of its proper divisors (1).

640946945711 is an equidigital number, since it uses as much as digits as its factorization.

640946945711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 640946945711 in words is "six hundred forty billion, nine hundred forty-six million, nine hundred forty-five thousand, seven hundred eleven".