643141642601 has 4 divisors (see below), whose sum is σ = 643936626900. Its totient is φ = 642346658304.

The previous prime is 643141642589. The next prime is 643141642651. The reversal of 643141642601 is 106246141346.

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 224817274201 + 418324368400 = 474149^2 + 646780^2 .

It is a cyclic number.

It is not a de Polignac number, because 643141642601 - 2¹⁴ = 643141626217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643141642651) 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, 397490936 + ... + 397492553.

It is an arithmetic number, because the mean of its divisors is an integer number (160984156725).

Almost surely, 2^643141642601 is an apocalyptic number.

It is an amenable number.

643141642601 is a deficient number, since it is larger than the sum of its proper divisors (794984299).

643141642601 is an equidigital number, since it uses as much as digits as its factorization.

643141642601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794984298.

The product of its (nonzero) digits is 82944, while the sum is 38.

Adding to 643141642601 its reverse (106246141346), we get a palindrome (749387783947).

The spelling of 643141642601 in words is "six hundred forty-three billion, one hundred forty-one million, six hundred forty-two thousand, six hundred one".