636118007243 has 4 divisors (see below), whose sum is σ = 636456549840. Its totient is φ = 635779464648.

The previous prime is 636118007197. The next prime is 636118007267. The reversal of 636118007243 is 342700811636.

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 636118007243 - 2¹⁶ = 636117941707 is a prime.

It is a super-2 number, since 2×636118007243² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 636118007243.

It is not an unprimeable number, because it can be changed into a prime (636118007443) 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, 169268480 + ... + 169272237.

It is an arithmetic number, because the mean of its divisors is an integer number (159114137460).

Almost surely, 2^636118007243 is an apocalyptic number.

636118007243 is a deficient number, since it is larger than the sum of its proper divisors (338542597).

636118007243 is a wasteful number, since it uses less digits than its factorization.

636118007243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338542596.

The product of its (nonzero) digits is 145152, while the sum is 41.

Adding to 636118007243 its reverse (342700811636), we get a palindrome (978818818879).

The spelling of 636118007243 in words is "six hundred thirty-six billion, one hundred eighteen million, seven thousand, two hundred forty-three".