40120405505 has 4 divisors (see below), whose sum is σ = 48144486612. Its totient is φ = 32096324400.

The previous prime is 40120405477. The next prime is 40120405531. The reversal of 40120405505 is 50550402104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4715843584 + 35404561921 = 68672^2 + 188161^2 .

It is not a de Polignac number, because 40120405505 - 2¹⁶ = 40120339969 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 4012040546 + ... + 4012040555.

It is an arithmetic number, because the mean of its divisors is an integer number (12036121653).

Almost surely, 2^40120405505 is an apocalyptic number.

It is an amenable number.

40120405505 is a deficient number, since it is larger than the sum of its proper divisors (8024081107).

40120405505 is an equidigital number, since it uses as much as digits as its factorization.

40120405505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8024081106.

The product of its (nonzero) digits is 4000, while the sum is 26.

Adding to 40120405505 its reverse (50550402104), we get a palindrome (90670807609).

The spelling of 40120405505 in words is "forty billion, one hundred twenty million, four hundred five thousand, five hundred five".