640323243055 has 8 divisors (see below), whose sum is σ = 768463588800. Its totient is φ = 512208129696.

The previous prime is 640323243037. The next prime is 640323243107. The reversal of 640323243055 is 550342323046.

640323243055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 640323243055 - 2¹⁵ = 640323210287 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6252220 + ... + 6353809.

It is an arithmetic number, because the mean of its divisors is an integer number (96057948600).

Almost surely, 2^640323243055 is an apocalyptic number.

640323243055 is a deficient number, since it is larger than the sum of its proper divisors (128140345745).

640323243055 is a wasteful number, since it uses less digits than its factorization.

640323243055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12616193.

The product of its (nonzero) digits is 259200, while the sum is 37.

The spelling of 640323243055 in words is "six hundred forty billion, three hundred twenty-three million, two hundred forty-three thousand, fifty-five".