40055365661 has 4 divisors (see below), whose sum is σ = 40537960512. Its totient is φ = 39572770812.

The previous prime is 40055365657. The next prime is 40055365673. The reversal of 40055365661 is 16656355004.

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.

It is a cyclic number.

It is not a de Polignac number, because 40055365661 - 2² = 40055365657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40055365621) 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, 241297301 + ... + 241297466.

It is an arithmetic number, because the mean of its divisors is an integer number (10134490128).

Almost surely, 2^40055365661 is an apocalyptic number.

It is an amenable number.

40055365661 is a deficient number, since it is larger than the sum of its proper divisors (482594851).

40055365661 is an equidigital number, since it uses as much as digits as its factorization.

40055365661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482594850.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 40055365661 in words is "forty billion, fifty-five million, three hundred sixty-five thousand, six hundred sixty-one".