643100131133311 has 4 divisors (see below), whose sum is σ = 643881540770992. Its totient is φ = 642318721495632.

The previous prime is 643100131133179. The next prime is 643100131133413. The reversal of 643100131133311 is 113331131001346.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 643100131133311 - 2¹³ = 643100131125119 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 (643100131130311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390704817606 + ... + 390704819251.

It is an arithmetic number, because the mean of its divisors is an integer number (160970385192748).

Almost surely, 2^{643100131133311} is an apocalyptic number.

643100131133311 is a deficient number, since it is larger than the sum of its proper divisors (781409637681).

643100131133311 is an equidigital number, since it uses as much as digits as its factorization.

643100131133311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781409637680.

The product of its (nonzero) digits is 5832, while the sum is 31.

Adding to 643100131133311 its reverse (113331131001346), we get a palindrome (756431262134657).

The spelling of 643100131133311 in words is "six hundred forty-three trillion, one hundred billion, one hundred thirty-one million, one hundred thirty-three thousand, three hundred eleven".