640450466503 has 4 divisors (see below), whose sum is σ = 640971582840. Its totient is φ = 639929350168.

The previous prime is 640450466489. The next prime is 640450466543. The reversal of 640450466503 is 305664054046.

640450466503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 640450466503 - 2¹³ = 640450458311 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 640450466503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640450466543) 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, 260556325 + ... + 260558782.

It is an arithmetic number, because the mean of its divisors is an integer number (160242895710).

Almost surely, 2^640450466503 is an apocalyptic number.

640450466503 is a deficient number, since it is larger than the sum of its proper divisors (521116337).

640450466503 is a wasteful number, since it uses less digits than its factorization.

640450466503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521116336.

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 640450466503 in words is "six hundred forty billion, four hundred fifty million, four hundred sixty-six thousand, five hundred three".