640438837223 has 8 divisors (see below), whose sum is σ = 653443526016. Its totient is φ = 627544827000.

The previous prime is 640438837193. The next prime is 640438837321. The reversal of 640438837223 is 322738834046.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640438837223 - 2⁸ = 640438836967 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 (640438837723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27657953 + ... + 27681098.

It is an arithmetic number, because the mean of its divisors is an integer number (81680440752).

Almost surely, 2^640438837223 is an apocalyptic number.

640438837223 is a deficient number, since it is larger than the sum of its proper divisors (13004688793).

640438837223 is a wasteful number, since it uses less digits than its factorization.

640438837223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55339285.

The product of its (nonzero) digits is 4644864, while the sum is 50.

The spelling of 640438837223 in words is "six hundred forty billion, four hundred thirty-eight million, eight hundred thirty-seven thousand, two hundred twenty-three".