640452345233 has 4 divisors (see below), whose sum is σ = 640775971440. Its totient is φ = 640128719028.

The previous prime is 640452345193. The next prime is 640452345271. The reversal of 640452345233 is 332543254046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640452345233 - 2¹⁴ = 640452328849 is a prime.

It is a super-3 number, since 3×640452345233³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640452345833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161810135 + ... + 161814092.

It is an arithmetic number, because the mean of its divisors is an integer number (160193992860).

Almost surely, 2^640452345233 is an apocalyptic number.

It is an amenable number.

640452345233 is a deficient number, since it is larger than the sum of its proper divisors (323626207).

640452345233 is a wasteful number, since it uses less digits than its factorization.

640452345233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323626206.

The product of its (nonzero) digits is 1036800, while the sum is 41.

Adding to 640452345233 its reverse (332543254046), we get a palindrome (972995599279).

The spelling of 640452345233 in words is "six hundred forty billion, four hundred fifty-two million, three hundred forty-five thousand, two hundred thirty-three".