643475820023 has 8 divisors (see below), whose sum is σ = 667410300480. Its totient is φ = 619885720800.

The previous prime is 643475820007. The next prime is 643475820061. The reversal of 643475820023 is 320028574346.

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 643475820023 - 2⁴ = 643475820007 is a prime.

It is a super-2 number, since 2×643475820023² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643475822023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86091503 + ... + 86098976.

It is an arithmetic number, because the mean of its divisors is an integer number (83426287560).

Almost surely, 2^643475820023 is an apocalyptic number.

643475820023 is a deficient number, since it is larger than the sum of its proper divisors (23934480457).

643475820023 is a wasteful number, since it uses less digits than its factorization.

643475820023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172190617.

The product of its (nonzero) digits is 967680, while the sum is 44.

The spelling of 643475820023 in words is "six hundred forty-three billion, four hundred seventy-five million, eight hundred twenty thousand, twenty-three".