636427688048779 has 4 divisors (see below), whose sum is σ = 694284750598680. Its totient is φ = 578570625498880.

The previous prime is 636427688048743. The next prime is 636427688048843. The reversal of 636427688048779 is 977840886724636.

636427688048779 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 is a cyclic number.

It is not a de Polignac number, because 636427688048779 - 2⁹ = 636427688048267 is a prime.

It is a super-3 number, since 3×636427688048779³ (a number of 45 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (85) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 636427688048696 and 636427688048705.

It is not an unprimeable number, because it can be changed into a prime (636427688088779) 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, 28928531274934 + ... + 28928531274955.

It is an arithmetic number, because the mean of its divisors is an integer number (173571187649670).

Almost surely, 2^{636427688048779} is an apocalyptic number.

636427688048779 is a deficient number, since it is larger than the sum of its proper divisors (57857062549901).

636427688048779 is a wasteful number, since it uses less digits than its factorization.

636427688048779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57857062549900.

The product of its (nonzero) digits is 32774160384, while the sum is 85.

The spelling of 636427688048779 in words is "six hundred thirty-six trillion, four hundred twenty-seven billion, six hundred eighty-eight million, forty-eight thousand, seven hundred seventy-nine".