40478515865 has 8 divisors (see below), whose sum is σ = 49119997320. Its totient is φ = 32018960512.

The previous prime is 40478515859. The next prime is 40478515937. The reversal of 40478515865 is 56851587404.

It can be written as a sum of positive squares in 4 ways, for example, as 844076809 + 39634439056 = 29053^2 + 199084^2 .

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 40478515865 - 2¹⁰ = 40478514841 is a prime.

It is a Curzon 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, 45481034 + ... + 45481923.

It is an arithmetic number, because the mean of its divisors is an integer number (6139999665).

Almost surely, 2^40478515865 is an apocalyptic number.

It is an amenable number.

40478515865 is a deficient number, since it is larger than the sum of its proper divisors (8641481455).

40478515865 is an equidigital number, since it uses as much as digits as its factorization.

40478515865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90963051.

The product of its (nonzero) digits is 5376000, while the sum is 53.

The spelling of 40478515865 in words is "forty billion, four hundred seventy-eight million, five hundred fifteen thousand, eight hundred sixty-five".