640460505403 has 4 divisors (see below), whose sum is σ = 641190791920. Its totient is φ = 639730218888.

The previous prime is 640460505389. The next prime is 640460505463. The reversal of 640460505403 is 304505064046.

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 640460505403 - 2¹⁷ = 640460374331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640460505463) 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, 365141943 + ... + 365143696.

It is an arithmetic number, because the mean of its divisors is an integer number (160297697980).

Almost surely, 2^640460505403 is an apocalyptic number.

640460505403 is a deficient number, since it is larger than the sum of its proper divisors (730286517).

640460505403 is an equidigital number, since it uses as much as digits as its factorization.

640460505403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730286516.

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 640460505403 its reverse (304505064046), we get a palindrome (944965569449).

The spelling of 640460505403 in words is "six hundred forty billion, four hundred sixty million, five hundred five thousand, four hundred three".