643406312603 has 8 divisors (see below), whose sum is σ = 677311211520. Its totient is φ = 609505554600.

The previous prime is 643406312581. The next prime is 643406312639. The reversal of 643406312603 is 306213604346.

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

It is a cyclic number.

It is not a de Polignac number, because 643406312603 - 2⁸ = 643406312347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643406312903) 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, 713723 + ... + 1340228.

It is an arithmetic number, because the mean of its divisors is an integer number (84663901440).

Almost surely, 2^643406312603 is an apocalyptic number.

643406312603 is a deficient number, since it is larger than the sum of its proper divisors (33904898917).

643406312603 is a wasteful number, since it uses less digits than its factorization.

643406312603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070457.

The product of its (nonzero) digits is 186624, while the sum is 38.

Adding to 643406312603 its reverse (306213604346), we get a palindrome (949619916949).

The spelling of 643406312603 in words is "six hundred forty-three billion, four hundred six million, three hundred twelve thousand, six hundred three".