640323243245 has 16 divisors (see below), whose sum is σ = 898579862400. Its totient is φ = 428867659584.

The previous prime is 640323243233. The next prime is 640323243269. The reversal of 640323243245 is 542342323046.

It is not a de Polignac number, because 640323243245 - 2²⁰ = 640322194669 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640323243199 and 640323243208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212730470 + ... + 212733479.

It is an arithmetic number, because the mean of its divisors is an integer number (56161241400).

Almost surely, 2^640323243245 is an apocalyptic number.

It is an amenable number.

640323243245 is a deficient number, since it is larger than the sum of its proper divisors (258256619155).

640323243245 is a wasteful number, since it uses less digits than its factorization.

640323243245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425464004.

The product of its (nonzero) digits is 414720, while the sum is 38.

The spelling of 640323243245 in words is "six hundred forty billion, three hundred twenty-three million, two hundred forty-three thousand, two hundred forty-five".