40236561217 has 2 divisors, whose sum is σ = 40236561218. Its totient is φ = 40236561216.

The previous prime is 40236561139. The next prime is 40236561227. The reversal of 40236561217 is 71216563204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39028373136 + 1208188081 = 197556^2 + 34759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40236561217 is a prime.

It is not a weakly prime, because it can be changed into another prime (40236561227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20118280608 + 20118280609.

It is an arithmetic number, because the mean of its divisors is an integer number (20118280609).

Almost surely, 2^40236561217 is an apocalyptic number.

It is an amenable number.

40236561217 is a deficient number, since it is larger than the sum of its proper divisors (1).

40236561217 is an equidigital number, since it uses as much as digits as its factorization.

40236561217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 40236561217 in words is "forty billion, two hundred thirty-six million, five hundred sixty-one thousand, two hundred seventeen".