643263362345 has 16 divisors (see below), whose sum is σ = 773862344640. Its totient is φ = 513313483584.

The previous prime is 643263362297. The next prime is 643263362377. The reversal of 643263362345 is 543263362346.

It is a cyclic number.

It is not a de Polignac number, because 643263362345 - 2⁸ = 643263362089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643263362345.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20374862 + ... + 20406408.

It is an arithmetic number, because the mean of its divisors is an integer number (48366396540).

Almost surely, 2^643263362345 is an apocalyptic number.

It is an amenable number.

643263362345 is a deficient number, since it is larger than the sum of its proper divisors (130598982295).

643263362345 is a wasteful number, since it uses less digits than its factorization.

643263362345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41704.

The product of its digits is 5598720, while the sum is 47.

Subtracting from 643263362345 its reverse (543263362346), we obtain a palindrome (99999999999).

The spelling of 643263362345 in words is "six hundred forty-three billion, two hundred sixty-three million, three hundred sixty-two thousand, three hundred forty-five".