640436206303 has 4 divisors (see below), whose sum is σ = 640459969848. Its totient is φ = 640412442760.

The previous prime is 640436206273. The next prime is 640436206331. The reversal of 640436206303 is 303602634046.

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 640436206303 - 2⁵ = 640436206271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640436206343) 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, 11841301 + ... + 11895262.

It is an arithmetic number, because the mean of its divisors is an integer number (160114992462).

Almost surely, 2^640436206303 is an apocalyptic number.

640436206303 is a deficient number, since it is larger than the sum of its proper divisors (23763545).

640436206303 is a wasteful number, since it uses less digits than its factorization.

640436206303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23763544.

The product of its (nonzero) digits is 186624, while the sum is 37.

The spelling of 640436206303 in words is "six hundred forty billion, four hundred thirty-six million, two hundred six thousand, three hundred three".