640143262463 has 4 divisors (see below), whose sum is σ = 640373781360. Its totient is φ = 639912743568.

The previous prime is 640143262427. The next prime is 640143262471. The reversal of 640143262463 is 364262341046.

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 640143262463 - 2¹² = 640143258367 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640143262463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640143262763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115255283 + ... + 115260836.

It is an arithmetic number, because the mean of its divisors is an integer number (160093445340).

Almost surely, 2^640143262463 is an apocalyptic number.

640143262463 is a deficient number, since it is larger than the sum of its proper divisors (230518897).

640143262463 is a wasteful number, since it uses less digits than its factorization.

640143262463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230518896.

The product of its (nonzero) digits is 497664, while the sum is 41.

The spelling of 640143262463 in words is "six hundred forty billion, one hundred forty-three million, two hundred sixty-two thousand, four hundred sixty-three".