636780536673 has 8 divisors (see below), whose sum is σ = 854738976000. Its totient is φ = 421671227568.

The previous prime is 636780536669. The next prime is 636780536681. The reversal of 636780536673 is 376635087636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 636780536673 - 2² = 636780536669 is a prime.

It is not an unprimeable number, because it can be changed into a prime (636780536603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712282033 + ... + 712282926.

It is an arithmetic number, because the mean of its divisors is an integer number (106842372000).

Almost surely, 2^636780536673 is an apocalyptic number.

It is an amenable number.

636780536673 is a deficient number, since it is larger than the sum of its proper divisors (217958439327).

636780536673 is a wasteful number, since it uses less digits than its factorization.

636780536673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424565111.

The product of its (nonzero) digits is 68584320, while the sum is 60.

The spelling of 636780536673 in words is "six hundred thirty-six billion, seven hundred eighty million, five hundred thirty-six thousand, six hundred seventy-three".