643541197823 has 8 divisors (see below), whose sum is σ = 666839999280. Its totient is φ = 620316244800.

The previous prime is 643541197801. The next prime is 643541197847. The reversal of 643541197823 is 328791145346.

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

It is a cyclic number.

It is not a de Polignac number, because 643541197823 - 2¹² = 643541193727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643541697823) 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, 18444365 + ... + 18479222.

It is an arithmetic number, because the mean of its divisors is an integer number (83354999910).

Almost surely, 2^643541197823 is an apocalyptic number.

643541197823 is a deficient number, since it is larger than the sum of its proper divisors (23298801457).

643541197823 is a wasteful number, since it uses less digits than its factorization.

643541197823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36924217.

The product of its digits is 4354560, while the sum is 53.

The spelling of 643541197823 in words is "six hundred forty-three billion, five hundred forty-one million, one hundred ninety-seven thousand, eight hundred twenty-three".