643513005467 has 4 divisors (see below), whose sum is σ = 660905248896. Its totient is φ = 626120762040.

The previous prime is 643513005409. The next prime is 643513005493. The reversal of 643513005467 is 764500315346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 764500315346 = 2 ⋅382250157673.

It is a cyclic number.

It is not a de Polignac number, because 643513005467 - 2⁶ = 643513005403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643513005497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8696121659 + ... + 8696121732.

It is an arithmetic number, because the mean of its divisors is an integer number (165226312224).

Almost surely, 2^643513005467 is an apocalyptic number.

643513005467 is a deficient number, since it is larger than the sum of its proper divisors (17392243429).

643513005467 is a wasteful number, since it uses less digits than its factorization.

643513005467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17392243428.

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 643513005467 in words is "six hundred forty-three billion, five hundred thirteen million, five thousand, four hundred sixty-seven".