640020371743 has 4 divisors (see below), whose sum is σ = 649034743248. Its totient is φ = 631006000240.

The previous prime is 640020371719. The next prime is 640020371759. The reversal of 640020371743 is 347173020046.

640020371743 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640020371743 - 2³⁷ = 502581418271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640020371143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4507185646 + ... + 4507185787.

It is an arithmetic number, because the mean of its divisors is an integer number (162258685812).

Almost surely, 2^640020371743 is an apocalyptic number.

640020371743 is a deficient number, since it is larger than the sum of its proper divisors (9014371505).

640020371743 is an equidigital number, since it uses as much as digits as its factorization.

640020371743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9014371504.

The product of its (nonzero) digits is 84672, while the sum is 37.

Adding to 640020371743 its reverse (347173020046), we get a palindrome (987193391789).

The spelling of 640020371743 in words is "six hundred forty billion, twenty million, three hundred seventy-one thousand, seven hundred forty-three".