643263362347 has 8 divisors (see below), whose sum is σ = 652341987072. Its totient is φ = 634185253800.

The previous prime is 643263362297. The next prime is 643263362377. The reversal of 643263362347 is 743263362346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643263362347 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 643263362347.

It is not an unprimeable number, because it can be changed into a prime (643263362377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2868772 + ... + 3084862.

It is an arithmetic number, because the mean of its divisors is an integer number (81542748384).

Almost surely, 2^643263362347 is an apocalyptic number.

643263362347 is a deficient number, since it is larger than the sum of its proper divisors (9078624725).

643263362347 is a wasteful number, since it uses less digits than its factorization.

643263362347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258089.

The product of its digits is 7838208, while the sum is 49.

Subtracting 643263362347 from its reverse (743263362346), we obtain a palindrome (99999999999).

The spelling of 643263362347 in words is "six hundred forty-three billion, two hundred sixty-three million, three hundred sixty-two thousand, three hundred forty-seven".