261442165415513 has 2 divisors, whose sum is σ = 261442165415514. Its totient is φ = 261442165415512.

The previous prime is 261442165415507. The next prime is 261442165415551. The reversal of 261442165415513 is 315514561244162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168612640218649 + 92829525196864 = 12985093^2 + 9634808^2 .

It is a cyclic number.

It is not a de Polignac number, because 261442165415513 - 2⁶ = 261442165415449 is a prime.

It is not a weakly prime, because it can be changed into another prime (261442165415713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130721082707756 + 130721082707757.

It is an arithmetic number, because the mean of its divisors is an integer number (130721082707757).

Almost surely, 2^{261442165415513} is an apocalyptic number.

It is an amenable number.

261442165415513 is a deficient number, since it is larger than the sum of its proper divisors (1).

261442165415513 is an equidigital number, since it uses as much as digits as its factorization.

261442165415513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456000, while the sum is 50.

The spelling of 261442165415513 in words is "two hundred sixty-one trillion, four hundred forty-two billion, one hundred sixty-five million, four hundred fifteen thousand, five hundred thirteen".