640143221407 has 2 divisors, whose sum is σ = 640143221408. Its totient is φ = 640143221406.

The previous prime is 640143221383. The next prime is 640143221449. The reversal of 640143221407 is 704122341046.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640143221407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640143221807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320071610703 + 320071610704.

It is an arithmetic number, because the mean of its divisors is an integer number (320071610704).

Almost surely, 2^640143221407 is an apocalyptic number.

640143221407 is a deficient number, since it is larger than the sum of its proper divisors (1).

640143221407 is an equidigital number, since it uses as much as digits as its factorization.

640143221407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 34.

The spelling of 640143221407 in words is "six hundred forty billion, one hundred forty-three million, two hundred twenty-one thousand, four hundred seven".