640043358629 has 2 divisors, whose sum is σ = 640043358630. Its totient is φ = 640043358628.

The previous prime is 640043358613. The next prime is 640043358631. The reversal of 640043358629 is 926853340046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474314577025 + 165728781604 = 688705^2 + 407098^2 .

It is a cyclic number.

It is not a de Polignac number, because 640043358629 - 2⁴ = 640043358613 is a prime.

Together with 640043358631, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640043358679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320021679314 + 320021679315.

It is an arithmetic number, because the mean of its divisors is an integer number (320021679315).

Almost surely, 2^640043358629 is an apocalyptic number.

It is an amenable number.

640043358629 is a deficient number, since it is larger than the sum of its proper divisors (1).

640043358629 is an equidigital number, since it uses as much as digits as its factorization.

640043358629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 50.

The spelling of 640043358629 in words is "six hundred forty billion, forty-three million, three hundred fifty-eight thousand, six hundred twenty-nine".