643452545403 has 24 divisors (see below), whose sum is σ = 964552761120. Its totient is φ = 412853051520.

The previous prime is 643452545399. The next prime is 643452545431. The reversal of 643452545403 is 304545254346.

643452545403 is a `hidden beast` number, since 6 + 4 + 3 + 4 + 52 + 54 + 540 + 3 = 666.

643452545403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643452545403 - 2² = 643452545399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643452545453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3856543 + ... + 4019928.

It is an arithmetic number, because the mean of its divisors is an integer number (40189698380).

Almost surely, 2^643452545403 is an apocalyptic number.

643452545403 is a deficient number, since it is larger than the sum of its proper divisors (321100215717).

643452545403 is a wasteful number, since it uses less digits than its factorization.

643452545403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7876819 (or 7876816 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 45.

Adding to 643452545403 its reverse (304545254346), we get a palindrome (947997799749).

The spelling of 643452545403 in words is "six hundred forty-three billion, four hundred fifty-two million, five hundred forty-five thousand, four hundred three".