40236320561 has 2 divisors, whose sum is σ = 40236320562. Its totient is φ = 40236320560.

The previous prime is 40236320507. The next prime is 40236320581. The reversal of 40236320561 is 16502363204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34831130161 + 5405190400 = 186631^2 + 73520^2 .

It is a cyclic number.

It is not a de Polignac number, because 40236320561 - 2¹⁸ = 40236058417 is a prime.

It is a super-2 number, since 2×40236320561² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40236320581) 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 as a sum of consecutive naturals, namely, 20118160280 + 20118160281.

It is an arithmetic number, because the mean of its divisors is an integer number (20118160281).

Almost surely, 2^40236320561 is an apocalyptic number.

It is an amenable number.

40236320561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40236320561 is an equidigital number, since it uses as much as digits as its factorization.

40236320561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 40236320561 its reverse (16502363204), we get a palindrome (56738683765).

The spelling of 40236320561 in words is "forty billion, two hundred thirty-six million, three hundred twenty thousand, five hundred sixty-one".