643716020983 has 8 divisors (see below), whose sum is σ = 743259736352. Its totient is φ = 546068376576.

The previous prime is 643716020971. The next prime is 643716021019. The reversal of 643716020983 is 389020617346.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643716020983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643716020933) 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, 474017010 + ... + 474018367.

It is an arithmetic number, because the mean of its divisors is an integer number (92907467044).

Almost surely, 2^643716020983 is an apocalyptic number.

643716020983 is a deficient number, since it is larger than the sum of its proper divisors (99543715369).

643716020983 is an equidigital number, since it uses as much as digits as its factorization.

643716020983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948035481.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 643716020983 in words is "six hundred forty-three billion, seven hundred sixteen million, twenty thousand, nine hundred eighty-three".