40665536409 has 8 divisors (see below), whose sum is σ = 57410169120. Its totient is φ = 25515630656.

The previous prime is 40665536323. The next prime is 40665536411. The reversal of 40665536409 is 90463556604.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40665536409 - 2¹⁷ = 40665405337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40665536419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398681679 + ... + 398681780.

It is an arithmetic number, because the mean of its divisors is an integer number (7176271140).

Almost surely, 2^40665536409 is an apocalyptic number.

It is an amenable number.

40665536409 is a deficient number, since it is larger than the sum of its proper divisors (16744632711).

40665536409 is a wasteful number, since it uses less digits than its factorization.

40665536409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797363479.

The product of its (nonzero) digits is 2332800, while the sum is 48.

The spelling of 40665536409 in words is "forty billion, six hundred sixty-five million, five hundred thirty-six thousand, four hundred nine".