643063540406 has 8 divisors (see below), whose sum is σ = 1102394640720. Its totient is φ = 275598660168.

The previous prime is 643063540337. The next prime is 643063540423. The reversal of 643063540406 is 604045360346.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22966555001 + ... + 22966555028.

It is an arithmetic number, because the mean of its divisors is an integer number (137799330090).

Almost surely, 2^643063540406 is an apocalyptic number.

643063540406 is a deficient number, since it is larger than the sum of its proper divisors (459331100314).

643063540406 is a wasteful number, since it uses less digits than its factorization.

643063540406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45933110038.

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 643063540406 in words is "six hundred forty-three billion, sixty-three million, five hundred forty thousand, four hundred six".