40553601565 has 4 divisors (see below), whose sum is σ = 48664321884. Its totient is φ = 32442881248.

The previous prime is 40553601563. The next prime is 40553601623. The reversal of 40553601565 is 56510635504.

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 14736503236 + 25817098329 = 121394^2 + 160677^2 .

It is a cyclic number.

It is not a de Polignac number, because 40553601565 - 2¹ = 40553601563 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 (40553601563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4055360152 + ... + 4055360161.

It is an arithmetic number, because the mean of its divisors is an integer number (12166080471).

Almost surely, 2^40553601565 is an apocalyptic number.

It is an amenable number.

40553601565 is a deficient number, since it is larger than the sum of its proper divisors (8110720319).

40553601565 is an equidigital number, since it uses as much as digits as its factorization.

40553601565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8110720318.

The product of its (nonzero) digits is 270000, while the sum is 40.

The spelling of 40553601565 in words is "forty billion, five hundred fifty-three million, six hundred one thousand, five hundred sixty-five".