1540520705597 has 2 divisors, whose sum is σ = 1540520705598. Its totient is φ = 1540520705596.

The previous prime is 1540520705569. The next prime is 1540520705609. The reversal of 1540520705597 is 7955070250451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1470546700921 + 69974004676 = 1212661^2 + 264526^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540520705597 - 2⁶ = 1540520705533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540520705557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770260352798 + 770260352799.

It is an arithmetic number, because the mean of its divisors is an integer number (770260352799).

Almost surely, 2^{1540520705597} is an apocalyptic number.

It is an amenable number.

1540520705597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540520705597 is an equidigital number, since it uses as much as digits as its factorization.

1540520705597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2205000, while the sum is 50.

The spelling of 1540520705597 in words is "one trillion, five hundred forty billion, five hundred twenty million, seven hundred five thousand, five hundred ninety-seven".