636761728761 has 8 divisors (see below), whose sum is σ = 871962007104. Its totient is φ = 413034634800.

The previous prime is 636761728747. The next prime is 636761728769. The reversal of 636761728761 is 167827167636.

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

It is not a de Polignac number, because 636761728761 - 2¹⁹ = 636761204473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 636761728695 and 636761728704.

It is not an unprimeable number, because it can be changed into a prime (636761728769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2868295965 + ... + 2868296186.

It is an arithmetic number, because the mean of its divisors is an integer number (108995250888).

Almost surely, 2^636761728761 is an apocalyptic number.

It is an amenable number.

636761728761 is a deficient number, since it is larger than the sum of its proper divisors (235200278343).

636761728761 is a wasteful number, since it uses less digits than its factorization.

636761728761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5736592191.

The product of its digits is 21337344, while the sum is 60.

The spelling of 636761728761 in words is "six hundred thirty-six billion, seven hundred sixty-one million, seven hundred twenty-eight thousand, seven hundred sixty-one".