145023205517 has 2 divisors, whose sum is σ = 145023205518. Its totient is φ = 145023205516.

The previous prime is 145023205513. The next prime is 145023205667. The reversal of 145023205517 is 715502320541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91289183881 + 53734021636 = 302141^2 + 231806^2 .

It is a cyclic number.

It is not a de Polignac number, because 145023205517 - 2² = 145023205513 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145023205511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72511602758 + 72511602759.

It is an arithmetic number, because the mean of its divisors is an integer number (72511602759).

Almost surely, 2^145023205517 is an apocalyptic number.

It is an amenable number.

145023205517 is a deficient number, since it is larger than the sum of its proper divisors (1).

145023205517 is an equidigital number, since it uses as much as digits as its factorization.

145023205517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42000, while the sum is 35.

The spelling of 145023205517 in words is "one hundred forty-five billion, twenty-three million, two hundred five thousand, five hundred seventeen".