40118643809 has 4 divisors (see below), whose sum is σ = 40119046704. Its totient is φ = 40118240916.

The previous prime is 40118643793. The next prime is 40118643841. The reversal of 40118643809 is 90834681104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40118643809 - 2⁴ = 40118643793 is a prime.

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 40118643809.

It is not an unprimeable number, because it can be changed into a prime (40118643889) 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 3 ways as a sum of consecutive naturals, for example, 68474 + ... + 291420.

It is an arithmetic number, because the mean of its divisors is an integer number (10029761676).

Almost surely, 2^40118643809 is an apocalyptic number.

It is an amenable number.

40118643809 is a deficient number, since it is larger than the sum of its proper divisors (402895).

40118643809 is a wasteful number, since it uses less digits than its factorization.

40118643809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402894.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 40118643809 in words is "forty billion, one hundred eighteen million, six hundred forty-three thousand, eight hundred nine".