505225166521 has 2 divisors, whose sum is σ = 505225166522. Its totient is φ = 505225166520.

The previous prime is 505225166489. The next prime is 505225166623. The reversal of 505225166521 is 125661522505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319473648400 + 185751518121 = 565220^2 + 430989^2 .

It is a cyclic number.

It is not a de Polignac number, because 505225166521 - 2⁵ = 505225166489 is a prime.

It is not a weakly prime, because it can be changed into another prime (505225167521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252612583260 + 252612583261.

It is an arithmetic number, because the mean of its divisors is an integer number (252612583261).

Almost surely, 2^505225166521 is an apocalyptic number.

It is an amenable number.

505225166521 is a deficient number, since it is larger than the sum of its proper divisors (1).

505225166521 is an equidigital number, since it uses as much as digits as its factorization.

505225166521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 505225166521 in words is "five hundred five billion, two hundred twenty-five million, one hundred sixty-six thousand, five hundred twenty-one".