643465311504 has 40 divisors (see below), whose sum is σ = 1689535975872. Its totient is φ = 210972232320.

The previous prime is 643465311487. The next prime is 643465311521. The reversal of 643465311504 is 405113564346.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (643465311487) and next prime (643465311521).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109878444 + ... + 109884299.

Almost surely, 2^643465311504 is an apocalyptic number.

It is an amenable number.

643465311504 is an abundant number, since it is smaller than the sum of its proper divisors (1046070664368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643465311504 is a wasteful number, since it uses less digits than its factorization.

643465311504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219762815 (or 219762809 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 643465311504 in words is "six hundred forty-three billion, four hundred sixty-five million, three hundred eleven thousand, five hundred four".