636622116685 has 16 divisors (see below), whose sum is σ = 817223598576. Its totient is φ = 474397360128.

The previous prime is 636622116671. The next prime is 636622116727. The reversal of 636622116685 is 586611226636.

It can be written as a sum of positive squares in 8 ways, for example, as 20379846564 + 616242270121 = 142758^2 + 785011^2 .

It is a cyclic number.

It is not a de Polignac number, because 636622116685 - 2³⁵ = 602262378317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38598312 + ... + 38614801.

It is an arithmetic number, because the mean of its divisors is an integer number (51076474911).

Almost surely, 2^636622116685 is an apocalyptic number.

It is an amenable number.

636622116685 is a deficient number, since it is larger than the sum of its proper divisors (180601481891).

636622116685 is a wasteful number, since it uses less digits than its factorization.

636622116685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77213232.

The product of its digits is 3732480, while the sum is 52.

The spelling of 636622116685 in words is "six hundred thirty-six billion, six hundred twenty-two million, one hundred sixteen thousand, six hundred eighty-five".