40131245665409 has 2 divisors, whose sum is σ = 40131245665410. Its totient is φ = 40131245665408.

The previous prime is 40131245665327. The next prime is 40131245665439. The reversal of 40131245665409 is 90456654213104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32560889626225 + 7570356039184 = 5706215^2 + 2751428^2 .

It is a cyclic number.

It is not a de Polignac number, because 40131245665409 - 2⁸ = 40131245665153 is a prime.

It is a super-2 number, since 2×40131245665409² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40131245665439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20065622832704 + 20065622832705.

It is an arithmetic number, because the mean of its divisors is an integer number (20065622832705).

Almost surely, 2^{40131245665409} is an apocalyptic number.

It is an amenable number.

40131245665409 is a deficient number, since it is larger than the sum of its proper divisors (1).

40131245665409 is an equidigital number, since it uses as much as digits as its factorization.

40131245665409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 40131245665409 in words is "forty trillion, one hundred thirty-one billion, two hundred forty-five million, six hundred sixty-five thousand, four hundred nine".