640503434001 has 4 divisors (see below), whose sum is σ = 854004578672. Its totient is φ = 427002289332.

The previous prime is 640503433981. The next prime is 640503434003. The reversal of 640503434001 is 100434305046.

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 not a de Polignac number, because 640503434001 - 2¹⁸ = 640503171857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640503434001.

It is not an unprimeable number, because it can be changed into a prime (640503434003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106750572331 + ... + 106750572336.

It is an arithmetic number, because the mean of its divisors is an integer number (213501144668).

Almost surely, 2^640503434001 is an apocalyptic number.

It is an amenable number.

640503434001 is a deficient number, since it is larger than the sum of its proper divisors (213501144671).

640503434001 is a wasteful number, since it uses less digits than its factorization.

640503434001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213501144670.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 640503434001 its reverse (100434305046), we get a palindrome (740937739047).

The spelling of 640503434001 in words is "six hundred forty billion, five hundred three million, four hundred thirty-four thousand, one".