725540606809 has 2 divisors, whose sum is σ = 725540606810. Its totient is φ = 725540606808.

The previous prime is 725540606803. The next prime is 725540606873. The reversal of 725540606809 is 908606045527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382177422025 + 343363184784 = 618205^2 + 585972^2 .

It is a cyclic number.

It is not a de Polignac number, because 725540606809 - 2³¹ = 723393123161 is a prime.

It is not a weakly prime, because it can be changed into another prime (725540606803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362770303404 + 362770303405.

It is an arithmetic number, because the mean of its divisors is an integer number (362770303405).

Almost surely, 2^725540606809 is an apocalyptic number.

It is an amenable number.

725540606809 is a deficient number, since it is larger than the sum of its proper divisors (1).

725540606809 is an equidigital number, since it uses as much as digits as its factorization.

725540606809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 725540606809 in words is "seven hundred twenty-five billion, five hundred forty million, six hundred six thousand, eight hundred nine".