640313632263 has 4 divisors (see below), whose sum is σ = 853751509688. Its totient is φ = 426875754840.

The previous prime is 640313632261. The next prime is 640313632279. The reversal of 640313632263 is 362236313046.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 640313632263 - 2¹ = 640313632261 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 (640313632261) 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, 106718938708 + ... + 106718938713.

It is an arithmetic number, because the mean of its divisors is an integer number (213437877422).

Almost surely, 2^640313632263 is an apocalyptic number.

640313632263 is a deficient number, since it is larger than the sum of its proper divisors (213437877425).

640313632263 is a wasteful number, since it uses less digits than its factorization.

640313632263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213437877424.

The product of its (nonzero) digits is 279936, while the sum is 39.

The spelling of 640313632263 in words is "six hundred forty billion, three hundred thirteen million, six hundred thirty-two thousand, two hundred sixty-three".