636761348851 has 4 divisors (see below), whose sum is σ = 664446624912. Its totient is φ = 609076072792.

The previous prime is 636761348849. The next prime is 636761348921. The reversal of 636761348851 is 158843167636.

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 636761348851 - 2¹ = 636761348849 is a prime.

It is a Smith number, since the sum of its digits (58) 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 not an unprimeable number, because it can be changed into a prime (636761348831) 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, 13842637996 + ... + 13842638041.

It is an arithmetic number, because the mean of its divisors is an integer number (166111656228).

Almost surely, 2^636761348851 is an apocalyptic number.

636761348851 is a deficient number, since it is larger than the sum of its proper divisors (27685276061).

636761348851 is a wasteful number, since it uses less digits than its factorization.

636761348851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27685276060.

The product of its digits is 17418240, while the sum is 58.

The spelling of 636761348851 in words is "six hundred thirty-six billion, seven hundred sixty-one million, three hundred forty-eight thousand, eight hundred fifty-one".