643420431001 has 4 divisors (see below), whose sum is σ = 643996457572. Its totient is φ = 642844404432.

The previous prime is 643420430969. The next prime is 643420431029. The reversal of 643420431001 is 100134024346.

643420431001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 171664376976 + 471756054025 = 414324^2 + 686845^2 .

It is a cyclic number.

It is not a de Polignac number, because 643420431001 - 2⁵ = 643420430969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643420431041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288011610 + ... + 288013843.

It is an arithmetic number, because the mean of its divisors is an integer number (160999114393).

Almost surely, 2^643420431001 is an apocalyptic number.

It is an amenable number.

643420431001 is a deficient number, since it is larger than the sum of its proper divisors (576026571).

643420431001 is a wasteful number, since it uses less digits than its factorization.

643420431001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576026570.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 643420431001 its reverse (100134024346), we get a palindrome (743554455347).

The spelling of 643420431001 in words is "six hundred forty-three billion, four hundred twenty million, four hundred thirty-one thousand, one".