640450466543 has 2 divisors, whose sum is σ = 640450466544. Its totient is φ = 640450466542.

The previous prime is 640450466489. The next prime is 640450466633. The reversal of 640450466543 is 345664054046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640450466543 - 2⁸ = 640450466287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640450469543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320225233271 + 320225233272.

It is an arithmetic number, because the mean of its divisors is an integer number (320225233272).

Almost surely, 2^640450466543 is an apocalyptic number.

640450466543 is a deficient number, since it is larger than the sum of its proper divisors (1).

640450466543 is an equidigital number, since it uses as much as digits as its factorization.

640450466543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4147200, while the sum is 47.

The spelling of 640450466543 in words is "six hundred forty billion, four hundred fifty million, four hundred sixty-six thousand, five hundred forty-three".