40505707521 has 6 divisors (see below), whose sum is σ = 58508244210. Its totient is φ = 27003805008.

The previous prime is 40505707519. The next prime is 40505707589. The reversal of 40505707521 is 12570750504.

It can be written as a sum of positive squares in only one way, i.e., 23397067521 + 17108640000 = 152961^2 + 130800^2 .

It is not a de Polignac number, because 40505707521 - 2¹ = 40505707519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40505807521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2250317076 + ... + 2250317093.

It is an arithmetic number, because the mean of its divisors is an integer number (9751374035).

Almost surely, 2^40505707521 is an apocalyptic number.

It is an amenable number.

40505707521 is a deficient number, since it is larger than the sum of its proper divisors (18002536689).

40505707521 is a wasteful number, since it uses less digits than its factorization.

40505707521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500634175 (or 4500634172 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 36.

The spelling of 40505707521 in words is "forty billion, five hundred five million, seven hundred seven thousand, five hundred twenty-one".