1225520565811 has 2 divisors, whose sum is σ = 1225520565812. Its totient is φ = 1225520565810.

The previous prime is 1225520565727. The next prime is 1225520565821. The reversal of 1225520565811 is 1185650255221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1225520565811 - 2⁹ = 1225520565299 is a prime.

It is not a weakly prime, because it can be changed into another prime (1225520565821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612760282905 + 612760282906.

It is an arithmetic number, because the mean of its divisors is an integer number (612760282906).

Almost surely, 2^{1225520565811} is an apocalyptic number.

1225520565811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225520565811 is an equidigital number, since it uses as much as digits as its factorization.

1225520565811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240000, while the sum is 43.

The spelling of 1225520565811 in words is "one trillion, two hundred twenty-five billion, five hundred twenty million, five hundred sixty-five thousand, eight hundred eleven".