40320312665 has 8 divisors (see below), whose sum is σ = 48496120008. Its totient is φ = 32181753600.

The previous prime is 40320312653. The next prime is 40320312673. The reversal of 40320312665 is 56621302304.

It can be written as a sum of positive squares in 4 ways, for example, as 2999095696 + 37321216969 = 54764^2 + 193187^2 .

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

It is not a de Polignac number, because 40320312665 - 2¹⁴ = 40320296281 is a prime.

It is a super-2 number, since 2×40320312665² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9309686 + ... + 9314015.

It is an arithmetic number, because the mean of its divisors is an integer number (6062015001).

Almost surely, 2^40320312665 is an apocalyptic number.

It is an amenable number.

40320312665 is a deficient number, since it is larger than the sum of its proper divisors (8175807343).

40320312665 is a wasteful number, since it uses less digits than its factorization.

40320312665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18624139.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 40320312665 its reverse (56621302304), we get a palindrome (96941614969).

The spelling of 40320312665 in words is "forty billion, three hundred twenty million, three hundred twelve thousand, six hundred sixty-five".