643923983049 has 8 divisors (see below), whose sum is σ = 858587268672. Its totient is φ = 429271676400.

The previous prime is 643923983047. The next prime is 643923983051. The reversal of 643923983049 is 940389329346.

It is an interprime number because it is at equal distance from previous prime (643923983047) and next prime (643923983051).

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

It is not a de Polignac number, because 643923983049 - 2¹ = 643923983047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643923982983 and 643923983001.

It is not an unprimeable number, because it can be changed into a prime (643923983047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2606902 + ... + 2843199.

It is an arithmetic number, because the mean of its divisors is an integer number (107323408584).

Almost surely, 2^643923983049 is an apocalyptic number.

It is an amenable number.

643923983049 is a deficient number, since it is larger than the sum of its proper divisors (214663285623).

643923983049 is a wasteful number, since it uses less digits than its factorization.

643923983049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5489487.

The product of its (nonzero) digits is 30233088, while the sum is 60.

The spelling of 643923983049 in words is "six hundred forty-three billion, nine hundred twenty-three million, nine hundred eighty-three thousand, forty-nine".