643071843494 has 8 divisors (see below), whose sum is σ = 971648698248. Its totient is φ = 319188944080.

The previous prime is 643071843461. The next prime is 643071843499. The reversal of 643071843494 is 494348170346.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643071843499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1173488492 + ... + 1173489039.

It is an arithmetic number, because the mean of its divisors is an integer number (121456087281).

Almost surely, 2^643071843494 is an apocalyptic number.

643071843494 is a deficient number, since it is larger than the sum of its proper divisors (328576854754).

643071843494 is a wasteful number, since it uses less digits than its factorization.

643071843494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346977670.

The product of its (nonzero) digits is 6967296, while the sum is 53.

The spelling of 643071843494 in words is "six hundred forty-three billion, seventy-one million, eight hundred forty-three thousand, four hundred ninety-four".