636133128643 has 2 divisors, whose sum is σ = 636133128644. Its totient is φ = 636133128642.

The previous prime is 636133128629. The next prime is 636133128751. The reversal of 636133128643 is 346821331636.

It is a happy number.

636133128643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 636133128643 - 2¹³ = 636133120451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 636133128593 and 636133128602.

It is not a weakly prime, because it can be changed into another prime (636133128623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318066564321 + 318066564322.

It is an arithmetic number, because the mean of its divisors is an integer number (318066564322).

Almost surely, 2^636133128643 is an apocalyptic number.

636133128643 is a deficient number, since it is larger than the sum of its proper divisors (1).

636133128643 is an equidigital number, since it uses as much as digits as its factorization.

636133128643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 46.

The spelling of 636133128643 in words is "six hundred thirty-six billion, one hundred thirty-three million, one hundred twenty-eight thousand, six hundred forty-three".