240623913647561 has 2 divisors, whose sum is σ = 240623913647562. Its totient is φ = 240623913647560.

The previous prime is 240623913647549. The next prime is 240623913647669. The reversal of 240623913647561 is 165746319326042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162174010379536 + 78449903268025 = 12734756^2 + 8857195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240623913647561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 240623913647561.

It is not a weakly prime, because it can be changed into another prime (240623913047561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120311956823780 + 120311956823781.

It is an arithmetic number, because the mean of its divisors is an integer number (120311956823781).

Almost surely, 2^{240623913647561} is an apocalyptic number.

It is an amenable number.

240623913647561 is a deficient number, since it is larger than the sum of its proper divisors (1).

240623913647561 is an equidigital number, since it uses as much as digits as its factorization.

240623913647561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39191040, while the sum is 59.

The spelling of 240623913647561 in words is "two hundred forty trillion, six hundred twenty-three billion, nine hundred thirteen million, six hundred forty-seven thousand, five hundred sixty-one".