145505505517 has 2 divisors, whose sum is σ = 145505505518. Its totient is φ = 145505505516.

The previous prime is 145505505499. The next prime is 145505505559. The reversal of 145505505517 is 715505505541.

145505505517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95588562276 + 49916943241 = 309174^2 + 223421^2 .

It is a cyclic number.

It is not a de Polignac number, because 145505505517 - 2⁷ = 145505505389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145505505017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72752752758 + 72752752759.

It is an arithmetic number, because the mean of its divisors is an integer number (72752752759).

Almost surely, 2^145505505517 is an apocalyptic number.

It is an amenable number.

145505505517 is a deficient number, since it is larger than the sum of its proper divisors (1).

145505505517 is an equidigital number, since it uses as much as digits as its factorization.

145505505517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 437500, while the sum is 43.

The spelling of 145505505517 in words is "one hundred forty-five billion, five hundred five million, five hundred five thousand, five hundred seventeen".