640455287663 has 4 divisors (see below), whose sum is σ = 640460448000. Its totient is φ = 640450127328.

The previous prime is 640455287657. The next prime is 640455287669. The reversal of 640455287663 is 366782554046.

640455287663 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 an interprime number because it is at equal distance from previous prime (640455287657) and next prime (640455287669).

It is a cyclic number.

It is not a de Polignac number, because 640455287663 - 2¹⁸ = 640455025519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640455287599 and 640455287608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640455287669) 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, 2389295 + ... + 2643792.

It is an arithmetic number, because the mean of its divisors is an integer number (160115112000).

Almost surely, 2^640455287663 is an apocalyptic number.

640455287663 is a deficient number, since it is larger than the sum of its proper divisors (5160337).

640455287663 is a wasteful number, since it uses less digits than its factorization.

640455287663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5160336.

The product of its (nonzero) digits is 29030400, while the sum is 56.

The spelling of 640455287663 in words is "six hundred forty billion, four hundred fifty-five million, two hundred eighty-seven thousand, six hundred sixty-three".