425523695609 has 2 divisors, whose sum is σ = 425523695610. Its totient is φ = 425523695608.

The previous prime is 425523695599. The next prime is 425523695731. The reversal of 425523695609 is 906596325524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392443361209 + 33080334400 = 626453^2 + 181880^2 .

It is a cyclic number.

It is not a de Polignac number, because 425523695609 - 2¹² = 425523691513 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (425523695209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212761847804 + 212761847805.

It is an arithmetic number, because the mean of its divisors is an integer number (212761847805).

Almost surely, 2^425523695609 is an apocalyptic number.

It is an amenable number.

425523695609 is a deficient number, since it is larger than the sum of its proper divisors (1).

425523695609 is an equidigital number, since it uses as much as digits as its factorization.

425523695609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496000, while the sum is 56.

The spelling of 425523695609 in words is "four hundred twenty-five billion, five hundred twenty-three million, six hundred ninety-five thousand, six hundred nine".