640503434031 has 8 divisors (see below), whose sum is σ = 854008338480. Its totient is φ = 427000409472.

The previous prime is 640503434029. The next prime is 640503434113. The reversal of 640503434031 is 130434305046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640503434031 - 2¹ = 640503434029 is a prime.

It is a super-2 number, since 2×640503434031² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640503433983 and 640503434001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640503434731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 874425 + ... + 1430253.

It is an arithmetic number, because the mean of its divisors is an integer number (106751042310).

Almost surely, 2^640503434031 is an apocalyptic number.

640503434031 is a deficient number, since it is larger than the sum of its proper divisors (213504904449).

640503434031 is a wasteful number, since it uses less digits than its factorization.

640503434031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939945.

The product of its (nonzero) digits is 51840, while the sum is 33.

Adding to 640503434031 its reverse (130434305046), we get a palindrome (770937739077).

The spelling of 640503434031 in words is "six hundred forty billion, five hundred three million, four hundred thirty-four thousand, thirty-one".