643466435 has 8 divisors (see below), whose sum is σ = 779376816. Its totient is φ = 509961760.

The previous prime is 643466431. The next prime is 643466437. The reversal of 643466435 is 534664346.

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

It is not a de Polignac number, because 643466435 - 2² = 643466431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643466392 and 643466401.

It is not an unprimeable number, because it can be changed into a prime (643466431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 600836 + ... + 601905.

It is an arithmetic number, because the mean of its divisors is an integer number (97422102).

Almost surely, 2^643466435 is an apocalyptic number.

643466435 is a deficient number, since it is larger than the sum of its proper divisors (135910381).

643466435 is a wasteful number, since it uses less digits than its factorization.

643466435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202853.

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

The square root of 643466435 is about 25366.6401992854. The cubic root of 643466435 is about 863.3269520290.

The spelling of 643466435 in words is "six hundred forty-three million, four hundred sixty-six thousand, four hundred thirty-five".