640211061323 has 12 divisors (see below), whose sum is σ = 683820570888. Its totient is φ = 599208295680.

The previous prime is 640211061317. The next prime is 640211061461. The reversal of 640211061323 is 323160112046.

It is not a de Polignac number, because 640211061323 - 2⁴ = 640211061307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640211066323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10653398 + ... + 10713323.

It is an arithmetic number, because the mean of its divisors is an integer number (56985047574).

Almost surely, 2^640211061323 is an apocalyptic number.

640211061323 is a deficient number, since it is larger than the sum of its proper divisors (43609509565).

640211061323 is a wasteful number, since it uses less digits than its factorization.

640211061323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21366842 (or 21366823 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 640211061323 its reverse (323160112046), we get a palindrome (963371173369).

The spelling of 640211061323 in words is "six hundred forty billion, two hundred eleven million, sixty-one thousand, three hundred twenty-three".