640310235331 has 4 divisors (see below), whose sum is σ = 689564868832. Its totient is φ = 591055601832.

The previous prime is 640310235293. The next prime is 640310235347. The reversal of 640310235331 is 133532013046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640310235331 - 2⁹ = 640310234819 is a prime.

It is a super-2 number, since 2×640310235331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640310235293 and 640310235302.

It is not an unprimeable number, because it can be changed into a prime (640310235391) 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 3 ways as a sum of consecutive naturals, for example, 24627316731 + ... + 24627316756.

It is an arithmetic number, because the mean of its divisors is an integer number (172391217208).

Almost surely, 2^640310235331 is an apocalyptic number.

640310235331 is a deficient number, since it is larger than the sum of its proper divisors (49254633501).

640310235331 is a wasteful number, since it uses less digits than its factorization.

640310235331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49254633500.

The product of its (nonzero) digits is 19440, while the sum is 31.

Adding to 640310235331 its reverse (133532013046), we get a palindrome (773842248377).

The spelling of 640310235331 in words is "six hundred forty billion, three hundred ten million, two hundred thirty-five thousand, three hundred thirty-one".