640408624043 has 2 divisors, whose sum is σ = 640408624044. Its totient is φ = 640408624042.

The previous prime is 640408624039. The next prime is 640408624117. The reversal of 640408624043 is 340426804046.

640408624043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640408624043 - 2² = 640408624039 is a prime.

It is not a weakly prime, because it can be changed into another prime (640408624033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320204312021 + 320204312022.

It is an arithmetic number, because the mean of its divisors is an integer number (320204312022).

Almost surely, 2^640408624043 is an apocalyptic number.

640408624043 is a deficient number, since it is larger than the sum of its proper divisors (1).

640408624043 is an equidigital number, since it uses as much as digits as its factorization.

640408624043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 442368, while the sum is 41.

The spelling of 640408624043 in words is "six hundred forty billion, four hundred eight million, six hundred twenty-four thousand, forty-three".