265560857801 has 2 divisors, whose sum is σ = 265560857802. Its totient is φ = 265560857800.

The previous prime is 265560857707. The next prime is 265560857839. The reversal of 265560857801 is 108758065562.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178547657401 + 87013200400 = 422549^2 + 294980^2 .

It is a cyclic number.

It is not a de Polignac number, because 265560857801 - 2¹⁰ = 265560856777 is a prime.

It is not a weakly prime, because it can be changed into another prime (265560857101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132780428900 + 132780428901.

It is an arithmetic number, because the mean of its divisors is an integer number (132780428901).

Almost surely, 2^265560857801 is an apocalyptic number.

It is an amenable number.

265560857801 is a deficient number, since it is larger than the sum of its proper divisors (1).

265560857801 is an equidigital number, since it uses as much as digits as its factorization.

265560857801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032000, while the sum is 53.

The spelling of 265560857801 in words is "two hundred sixty-five billion, five hundred sixty million, eight hundred fifty-seven thousand, eight hundred one".