640436063335 has 4 divisors (see below), whose sum is σ = 768523276008. Its totient is φ = 512348850664.

The previous prime is 640436063297. The next prime is 640436063401. The reversal of 640436063335 is 533360634046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 533360634046 = 2 ⋅266680317023.

It is a cyclic number.

It is not a de Polignac number, because 640436063335 - 2⁷ = 640436063207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640436063291 and 640436063300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64043606329 + ... + 64043606338.

It is an arithmetic number, because the mean of its divisors is an integer number (192130819002).

Almost surely, 2^640436063335 is an apocalyptic number.

640436063335 is a deficient number, since it is larger than the sum of its proper divisors (128087212673).

640436063335 is a wasteful number, since it uses less digits than its factorization.

640436063335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128087212672.

The product of its (nonzero) digits is 1399680, while the sum is 43.

The spelling of 640436063335 in words is "six hundred forty billion, four hundred thirty-six million, sixty-three thousand, three hundred thirty-five".