640503344434 has 8 divisors (see below), whose sum is σ = 964223447148. Its totient is φ = 319095528720.

The previous prime is 640503344419. The next prime is 640503344443. The reversal of 640503344434 is 434443305046.

It can be written as a sum of positive squares in 2 ways, for example, as 609331676409 + 31171668025 = 780597^2 + 176555^2 .

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

It is a super-2 number, since 2×640503344434² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

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, 578071057 + ... + 578072164.

Almost surely, 2^640503344434 is an apocalyptic number.

640503344434 is a deficient number, since it is larger than the sum of its proper divisors (323720102714).

640503344434 is a wasteful number, since it uses less digits than its factorization.

640503344434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156143500.

The product of its (nonzero) digits is 829440, while the sum is 40.

The spelling of 640503344434 in words is "six hundred forty billion, five hundred three million, three hundred forty-four thousand, four hundred thirty-four".