643073448386 has 8 divisors (see below), whose sum is σ = 964724204604. Its totient is φ = 321498713520.

The previous prime is 643073448371. The next prime is 643073448421. The reversal of 643073448386 is 683844370346.

It can be written as a sum of positive squares in 2 ways, for example, as 629554968025 + 13518480361 = 793445^2 + 116269^2 .

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

It is a super-2 number, since 2×643073448386² (a number of 24 digits) contains 22 as substring.

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, 18984185 + ... + 19018028.

Almost surely, 2^643073448386 is an apocalyptic number.

643073448386 is a deficient number, since it is larger than the sum of its proper divisors (321650756218).

643073448386 is a wasteful number, since it uses less digits than its factorization.

643073448386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38010676.

The product of its (nonzero) digits is 27869184, while the sum is 56.

The spelling of 643073448386 in words is "six hundred forty-three billion, seventy-three million, four hundred forty-eight thousand, three hundred eighty-six".