40505045521 has 8 divisors (see below), whose sum is σ = 40542460904. Its totient is φ = 40467651840.

The previous prime is 40505045467. The next prime is 40505045593. The reversal of 40505045521 is 12554050504.

It can be written as a sum of positive squares in 4 ways, for example, as 862244496 + 39642801025 = 29364^2 + 199105^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40505045521 is a prime.

It is a super-2 number, since 2×40505045521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40505045221) 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 7 ways as a sum of consecutive naturals, for example, 8208571 + ... + 8213503.

It is an arithmetic number, because the mean of its divisors is an integer number (5067807613).

Almost surely, 2^40505045521 is an apocalyptic number.

It is an amenable number.

40505045521 is a deficient number, since it is larger than the sum of its proper divisors (37415383).

40505045521 is a wasteful number, since it uses less digits than its factorization.

40505045521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10851.

The product of its (nonzero) digits is 20000, while the sum is 31.

The spelling of 40505045521 in words is "forty billion, five hundred five million, forty-five thousand, five hundred twenty-one".