640137102331 has 4 divisors (see below), whose sum is σ = 640192198464. Its totient is φ = 640082006200.

The previous prime is 640137102323. The next prime is 640137102433. The reversal of 640137102331 is 133201731046.

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 640137102331 - 2³ = 640137102323 is a prime.

It is a super-2 number, since 2×640137102331² (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 = 640137102293 and 640137102302.

It is not an unprimeable number, because it can be changed into a prime (640137102931) 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, 27530635 + ... + 27553876.

It is an arithmetic number, because the mean of its divisors is an integer number (160048049616).

Almost surely, 2^640137102331 is an apocalyptic number.

640137102331 is a deficient number, since it is larger than the sum of its proper divisors (55096133).

640137102331 is a wasteful number, since it uses less digits than its factorization.

640137102331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55096132.

The product of its (nonzero) digits is 9072, while the sum is 31.

Adding to 640137102331 its reverse (133201731046), we get a palindrome (773338833377).

The spelling of 640137102331 in words is "six hundred forty billion, one hundred thirty-seven million, one hundred two thousand, three hundred thirty-one".