640454505813 has 12 divisors (see below), whose sum is σ = 925130632608. Its totient is φ = 426955972200.

The previous prime is 640454505797. The next prime is 640454505841. The reversal of 640454505813 is 318505454046.

640454505813 is a `hidden beast` number, since 6 + 40 + 4 + 545 + 0 + 58 + 13 = 666.

It is not a de Polignac number, because 640454505813 - 2⁴ = 640454505797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640454505413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 841263 + ... + 1410188.

It is an arithmetic number, because the mean of its divisors is an integer number (77094219384).

Almost surely, 2^640454505813 is an apocalyptic number.

It is an amenable number.

640454505813 is a deficient number, since it is larger than the sum of its proper divisors (284676126795).

640454505813 is a wasteful number, since it uses less digits than its factorization.

640454505813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283064 (or 2283061 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 45.

Adding to 640454505813 its reverse (318505454046), we get a palindrome (958959959859).

The spelling of 640454505813 in words is "six hundred forty billion, four hundred fifty-four million, five hundred five thousand, eight hundred thirteen".